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Jul 13, 2016 am 10:14 AM

yii

yii源码分析1，yii源码分析

转载请注明：TheViper http://www.cnblogs.com/TheViper/

本文将对yii中的mvc,路由器，filter,组件机制等最主要的部分进行自己的一点浅析，力求说明自己做一个php mvc不是那么的遥不可及，其实是很简单的。

源码基于yii 1.13,为了方便说明，我对其进行了大量的裁剪，不过还是让他保有上面的那些最重要的功能。裁剪下来，其实没有几个文件了，而且每个文件代码最多100多行，避免因为代码太多而懒得看。

所谓的mvc都是让所有请求从一个地方进去，通过对请求，配置的解析，分发到对应的类方法中。

首先当然是入口文件，index.php.

<span>1</span> <?<span>php
</span><span>2</span> <span>$app</span> = "app"<span>;
</span><span>3</span> <span>$yii</span> = <span>dirname</span> ( <span>__FILE__</span> ) . '/framework/yii.php'<span>;
</span><span>4</span> <span>$config</span> = <span>dirname</span> ( <span>__FILE__</span> ) . '/app/protected/config/main.php';<span>//</span><span>载入配置</span>
<span>5</span> <span>require_once</span> (<span>$yii</span><span>);
</span><span>6</span> Yii::createWebApplication ( <span>$config</span> )->run ();

引入yii.php

<span>1</span> <?<span>php
</span><span>2</span> <span>define</span> ( "VIEWS_DIR", "<span>$app</span>/protected/views/"<span> );
</span><span>3</span> <span>define</span> ( "CONTROLLERS_DIR", "<span>$app</span>/protected/controllers/"<span> );
</span><span>4</span> <span>require</span>(<span>dirname</span>(<span>__FILE__</span>).'/YiiBase.php'<span>);
</span><span>5</span> <span>class</span> Yii <span>extends</span><span> YiiBase
</span><span>6</span> <span>{
</span><span>7</span> }

原来yii是个空的类啊，去看YiiBase.

<span>  1</span> <?<span>php
</span><span>  2</span> <span>defined</span> ( 'YII_PATH' ) or <span>define</span> ( 'YII_PATH', <span>dirname</span> ( <span>__FILE__</span><span> ) );
</span><span>  3</span> <span>class</span><span> YiiBase {
</span><span>  4</span>     <span>public</span> <span>static</span> <span>$classMap</span> = <span>array</span><span> ();
</span><span>  5</span>     <span>public</span> <span>static</span> <span>$enableIncludePath</span> = <span>true</span><span>;
</span><span>  6</span>     <span>private</span> <span>static</span> <span>$_aliases</span> = <span>array</span><span> (
</span><span>  7</span>             'system' =><span> YII_PATH 
</span><span>  8</span>     ); <span>//</span><span> alias => path</span>
<span>  9</span>     <span>private</span> <span>static</span> <span>$_imports</span> = <span>array</span> (); <span>//</span><span> alias => class name or directory</span>
<span> 10</span>     <span>private</span> <span>static</span> <span>$_includePaths</span>; <span>//</span><span> list of include paths</span>
<span> 11</span>     <span>private</span> <span>static</span> <span>$_app</span><span>;
</span><span> 12</span>     <span>private</span> <span>static</span> <span>$_logger</span><span>;
</span><span> 13</span>     <span>public</span> <span>static</span> <span>function</span> createWebApplication(<span>$config</span> = <span>null</span><span>) {
</span><span> 14</span>         <span>return</span> self::createApplication ( 'CWebApplication', <span>$config</span><span> );
</span><span> 15</span> <span>    }
</span><span> 16</span>     <span>public</span> <span>static</span> <span>function</span> createApplication(<span>$class</span>, <span>$config</span> = <span>null</span><span>) {
</span><span> 17</span>         <span>return</span> <span>new</span> <span>$class</span> ( <span>$config</span><span> );
</span><span> 18</span> <span>    }
</span><span> 19</span>     <span>public</span> <span>static</span> <span>function</span><span> app() {
</span><span> 20</span>         <span>return</span> self::<span>$_app</span><span>;
</span><span> 21</span> <span>    }
</span><span> 22</span>     <span>//</span><span>别名路径</span>
<span> 23</span>     <span>public</span> <span>static</span> <span>function</span> getPathOfAlias(<span>$alias</span><span>) {
</span><span> 24</span>         <span>if</span> (<span>isset</span> ( self::<span>$_aliases</span> [<span>$alias</span><span>] ))
</span><span> 25</span>             <span>return</span> self::<span>$_aliases</span> [<span>$alias</span><span>];
</span><span> 26</span>         <span>elseif</span> ((<span>$pos</span> = <span>strpos</span> ( <span>$alias</span>, '.' )) !== <span>false</span><span>) {
</span><span> 27</span>             <span>$rootAlias</span> = <span>substr</span> ( <span>$alias</span>, 0, <span>$pos</span><span> );
</span><span> 28</span>             <span>if</span> (<span>isset</span> ( self::<span>$_aliases</span> [<span>$rootAlias</span><span>] ))
</span><span> 29</span>                 <span>return</span> self::<span>$_aliases</span> [<span>$alias</span>] = <span>rtrim</span> ( self::<span>$_aliases</span> [<span>$rootAlias</span>] . DIRECTORY_SEPARATOR . <span>str_replace</span> ( '.', DIRECTORY_SEPARATOR, <span>substr</span> ( <span>$alias</span>, <span>$pos</span> + 1 ) ), '*' .<span> DIRECTORY_SEPARATOR );
</span><span> 30</span> <span>        }
</span><span> 31</span>         <span>return</span> <span>false</span><span>;
</span><span> 32</span> <span>    }
</span><span> 33</span>     <span>public</span> <span>static</span> <span>function</span> setPathOfAlias(<span>$alias</span>, <span>$path</span><span>) {
</span><span> 34</span>         <span>if</span> (<span>empty</span> ( <span>$path</span><span> ))
</span><span> 35</span>             <span>unset</span> ( self::<span>$_aliases</span> [<span>$alias</span><span>] );
</span><span> 36</span>         <span>else</span>
<span> 37</span>             self::<span>$_aliases</span> [<span>$alias</span>] = <span>rtrim</span> ( <span>$path</span>, '\\/'<span> );
</span><span> 38</span> <span>    }
</span><span> 39</span>     <span>public</span> <span>static</span> <span>function</span> setApplication(<span>$app</span><span>) {
</span><span> 40</span>         <span>if</span> (self::<span>$_app</span> === <span>null</span> || <span>$app</span> === <span>null</span><span>)
</span><span> 41</span>             self::<span>$_app</span> = <span>$app</span><span>;
</span><span> 42</span> <span>    }
</span><span> 43</span>     <span>public</span> <span>static</span> <span>function</span> import(<span>$alias</span>, <span>$forceInclude</span> = <span>false</span><span>) {
</span><span> 44</span>         <span>if</span> (<span>isset</span> ( self::<span>$_imports</span> [<span>$alias</span>] )) <span>//</span><span> previously imported</span>
<span> 45</span>             <span>return</span> self::<span>$_imports</span> [<span>$alias</span><span>];
</span><span> 46</span>         
<span> 47</span>         <span>if</span> (<span>class_exists</span> ( <span>$alias</span>, <span>false</span> ) || <span>interface_exists</span> ( <span>$alias</span>, <span>false</span><span> ))
</span><span> 48</span>             <span>return</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$alias</span><span>;
</span><span> 49</span>         <span>if</span> ((<span>$pos</span> = <span>strrpos</span> ( <span>$alias</span>, '.' )) === <span>false</span>)         <span>//</span><span> a simple class name</span>
<span> 50</span> <span>        {
</span><span> 51</span>             <span>//</span><span> try to autoload the class with an autoloader if $forceInclude is true</span>
<span> 52</span>             <span>if</span> (<span>$forceInclude</span> && (Yii::autoload ( <span>$alias</span>, <span>true</span> ) || <span>class_exists</span> ( <span>$alias</span>, <span>true</span><span> )))
</span><span> 53</span>                 self::<span>$_imports</span> [<span>$alias</span>] = <span>$alias</span><span>;
</span><span> 54</span>             <span>return</span> <span>$alias</span><span>;
</span><span> 55</span> <span>        }
</span><span> 56</span>         
<span> 57</span>         <span>$className</span> = ( <span>string</span> ) <span>substr</span> ( <span>$alias</span>, <span>$pos</span> + 1<span> );
</span><span> 58</span>         <span>$isClass</span> = <span>$className</span> !== '*'<span>;
</span><span> 59</span>         
<span> 60</span>         <span>if</span> (<span>$isClass</span> && (<span>class_exists</span> ( <span>$className</span>, <span>false</span> ) || <span>interface_exists</span> ( <span>$className</span>, <span>false</span><span> )))
</span><span> 61</span>             <span>return</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$className</span><span>;
</span><span> 62</span>         
<span> 63</span>         <span>if</span> ((<span>$path</span> = self::getPathOfAlias ( <span>$alias</span> )) !== <span>false</span><span>) {
</span><span> 64</span>             <span>if</span> (<span>$isClass</span><span>) {
</span><span> 65</span>                 <span>if</span> (<span>$forceInclude</span><span>) {
</span><span> 66</span>                     <span>if</span> (<span>is_file</span> ( <span>$path</span> . '.php'<span> ))
</span><span> 67</span>                         <span>require</span> (<span>$path</span> . '.php'<span>);
</span><span> 68</span>                     <span>else</span>
<span> 69</span>                         <span>throw</span> <span>new</span> CException ( Yii::t ( 'yii', 'Alias "{alias}" is invalid. Make sure it points to an existing PHP file and the file is readable.', <span>array</span><span> (
</span><span> 70</span>                                 '{alias}' => <span>$alias</span> 
<span> 71</span> <span>                        ) ) );
</span><span> 72</span>                     self::<span>$_imports</span> [<span>$alias</span>] = <span>$className</span><span>;
</span><span> 73</span>                 } <span>else</span>
<span> 74</span>                     self::<span>$classMap</span> [<span>$className</span>] = <span>$path</span> . '.php'<span>;
</span><span> 75</span>                 <span>return</span> <span>$className</span><span>;
</span><span> 76</span>             } <span>else</span>             <span>//</span><span> a directory</span>
<span> 77</span> <span>            {
</span><span> 78</span>                 <span>if</span> (self::<span>$_includePaths</span> === <span>null</span><span>) {
</span><span> 79</span>                     self::<span>$_includePaths</span> = <span>array_unique</span> ( <span>explode</span> ( PATH_SEPARATOR, <span>get_include_path</span><span> () ) );
</span><span> 80</span>                     <span>if</span> ((<span>$pos</span> = <span>array_search</span> ( '.', self::<span>$_includePaths</span>, <span>true</span> )) !== <span>false</span><span>)
</span><span> 81</span>                         <span>unset</span> ( self::<span>$_includePaths</span> [<span>$pos</span><span>] );
</span><span> 82</span> <span>                }
</span><span> 83</span>                 
<span> 84</span>                 <span>array_unshift</span> ( self::<span>$_includePaths</span>, <span>$path</span><span> );
</span><span> 85</span>                 
<span> 86</span>                 <span>if</span> (self::<span>$enableIncludePath</span> && <span>set_include_path</span> ( '.' . PATH_SEPARATOR . <span>implode</span> ( PATH_SEPARATOR, self::<span>$_includePaths</span> ) ) === <span>false</span><span>)
</span><span> 87</span>                     self::<span>$enableIncludePath</span> = <span>false</span><span>;
</span><span> 88</span>                 
<span> 89</span>                 <span>return</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$path</span><span>;
</span><span> 90</span> <span>            }
</span><span> 91</span> <span>        }
</span><span> 92</span> <span>    }
</span><span> 93</span>     <span>//</span><span>创建组件实例</span>
<span> 94</span>     <span>public</span> <span>static</span> <span>function</span> createComponent(<span>$config</span><span>) {
</span><span> 95</span>         <span>if</span> (<span>is_string</span> ( <span>$config</span><span> )) {
</span><span> 96</span>             <span>$type</span> = <span>$config</span><span>;
</span><span> 97</span>             <span>$config</span> = <span>array</span><span> ();
</span><span> 98</span>         } <span>elseif</span> (<span>isset</span> ( <span>$config</span> ['class'<span>] )) {
</span><span> 99</span>             <span>$type</span> = <span>$config</span> ['class'<span>];
</span><span>100</span>             <span>unset</span> ( <span>$config</span> ['class'<span>] );
</span><span>101</span> <span>        }
</span><span>102</span>         <span>if</span> (! <span>class_exists</span> ( <span>$type</span>, <span>false</span><span> )) {
</span><span>103</span>             <span>$type</span> = Yii::import ( <span>$type</span>, <span>true</span><span> );
</span><span>104</span> <span>        }
</span><span>105</span>         <span>if</span> ((<span>$n</span> = <span>func_num_args</span> ()) > 1<span>) {
</span><span>106</span>             <span>$args</span> = <span>func_get_args</span><span> ();
</span><span>107</span>             <span>if</span> (<span>$n</span> === 2<span>)
</span><span>108</span>                 <span>$object</span> = <span>new</span> <span>$type</span> ( <span>$args</span> [1<span>] );
</span><span>109</span>             <span>elseif</span> (<span>$n</span> === 3<span>)
</span><span>110</span>                 <span>$object</span> = <span>new</span> <span>$type</span> ( <span>$args</span> [1], <span>$args</span> [2<span>] );
</span><span>111</span>             <span>elseif</span> (<span>$n</span> === 4<span>)
</span><span>112</span>                 <span>$object</span> = <span>new</span> <span>$type</span> ( <span>$args</span> [1], <span>$args</span> [2], <span>$args</span> [3<span>] );
</span><span>113</span>             <span>else</span><span> {
</span><span>114</span>                 <span>unset</span> ( <span>$args</span> [0<span>] );
</span><span>115</span>                 <span>$class</span> = <span>new</span> ReflectionClass ( <span>$type</span><span> );
</span><span>116</span>                 <span>//</span><span> Note: ReflectionClass::newInstanceArgs() is available for PHP 5.1.3+
</span><span>117</span> <span>                // $object=$class->newInstanceArgs($args);</span>
<span>118</span>                 <span>$object</span> = <span>call_user_func_array</span> ( <span>array</span><span> (
</span><span>119</span>                         <span>$class</span>,
<span>120</span>                         'newInstance' 
<span>121</span>                 ), <span>$args</span><span> );
</span><span>122</span> <span>            }
</span><span>123</span>         } <span>else</span>
<span>124</span>             <span>$object</span> = <span>new</span> <span>$type</span><span> ();
</span><span>125</span>         <span>foreach</span> ( <span>$config</span> <span>as</span> <span>$key</span> => <span>$value</span><span> )
</span><span>126</span>             <span>$object</span>-><span>$key</span> = <span>$value</span><span>;
</span><span>127</span>         
<span>128</span>         <span>return</span> <span>$object</span><span>;
</span><span>129</span> <span>    }
</span><span>130</span>     <span>//</span><span>按需加载相应的php</span>
<span>131</span>     <span>public</span> <span>static</span> <span>function</span> autoload(<span>$className</span><span>) {
</span><span>132</span>         <span>include</span> self::<span>$_coreClasses</span> [<span>$className</span><span>];
</span><span>133</span> <span>    }
</span><span>134</span>     <span>private</span> <span>static</span> <span>$_coreClasses</span> = <span>array</span><span> (
</span><span>135</span>             'CApplication' => '/base/CApplication.php',
<span>136</span>             'CModule' => '/base/CModule.php',
<span>137</span>             'CWebApplication' => '/base/CWebApplication.php',
<span>138</span>             'CUrlManager' => 'CUrlManager.php',
<span>139</span>             'CComponent' => '/base/CComponent.php'
<span>140</span>         ,    'CUrlRule' => 'CUrlRule.php',
<span>141</span>             'CController' => 'CController.php',
<span>142</span>             'CInlineAction' => '/actions/CInlineAction.php',
<span>143</span>             'CAction' => '/actions/CAction.php',
<span>144</span>             'CFilterChain' => '/filters/CFilterChain.php',
<span>145</span>             'CFilter' => '/filters/CFilter.php',
<span>146</span>             'CList' => '/collections/CList.php',
<span>147</span>             'CHttpRequest' => 'CHttpRequest.php',
<span>148</span>             'CDb' => 'CDb.php',
<span>149</span>             'CInlineFilter' => 'filters/CInlineFilter.php' 
<span>150</span> <span>    );
</span><span>151</span> <span>}
</span><span>152</span> 
<span>153</span> spl_autoload_register ( <span>array</span><span> (
</span><span>154</span>         'YiiBase',
<span>155</span>         'autoload' 
<span>156</span> ) );

看似很多，其实就三个地方注意下就可以了

1.spl_autoload_register,用这个就可以实现传说中的按需加载相应的php了,坑爹啊。

2.createComponent($config)这个方法是yii组件调用的核心。在配置中注册的所有组件都是通过它获取组件类的实例的。比如配置：

<span> 1</span> <?<span>php
</span><span> 2</span> <span>return</span> <span>array</span><span> (
</span><span> 3</span>         'basePath' => <span>dirname</span> ( <span>__FILE__</span> ) . DIRECTORY_SEPARATOR . '..',
<span> 4</span>         
<span> 5</span>         'import' => <span>array</span><span> (
</span><span> 6</span>                 'application.util.*' 
<span> 7</span>         ),
<span> 8</span>         
<span> 9</span>         'components' => <span>array</span><span> (
</span><span>10</span>                 'db' => <span>array</span><span> (
</span><span>11</span>                         'class' => 'CDb',
<span>12</span>                         'driver' => 'mysql',
<span>13</span>                         'hostname' => 'localhost',
<span>14</span>                         'username' => 'root',
<span>15</span>                         'password' => '',
<span>16</span>                         'database' => 'youtube' 
<span>17</span>                 ),
<span>18</span>                 'urlManager' => <span>array</span><span> (
</span><span>19</span>                         'urlFormat' => 'path',
<span>20</span>                         'rules' => <span>array</span><span> (
</span><span>21</span>                                 'comment_reply/<a:\d+>/<ci:\d+>' => 'reply/load_comment_reply',
<span>22</span>                                 'b/<id:\d+>' => <span>array</span><span> (
</span><span>23</span>                                         'video/broadcast',
<span>24</span>                                         'urlSuffix' => '.html' 
<span>25</span>                                 ),
<span>26</span>                                 'c/<list_start:\d+>' => 'video/list_more_video',
<span>27</span>                                 'u/reg' => 'user/reg',
<span>28</span>                                 'v/upload' => 'video/upload_video',
<span>29</span>                                 'login' => 'user/to_login',
<span>30</span>                                 'show_chanel/<chanel_id:\d+>' => 'show/chanel' ,
<span>31</span>                                 'show/<show_id:\d+>' => 'show/show',
<span>32</span> <span>                        ) 
</span><span>33</span> <span>                ) 
</span><span>34</span> <span>        ) 
</span><span>35</span> <span>);
</span><span>36</span> ?>

这个文件就返回了个map,里面components中的db,urlManager便是我注册的系统中的组件,里面的array便是组件的参数.

从源码中看到$type = $config ['class'];$object = new $type;就创建了注册的类实例了。

3.import($alias, $forceInclude = false)。作用：导入一个类或一个目录。导入一个类就像包含相应的类文件。主要区别是导入一个类比较轻巧，它仅在类文件首次引用时包含。这个也是yii的一个核心优化点。

这个在上面createComponent($config)中有用到，

if (!class_exists ( $type, false )) {
　　$type = Yii::import ( $type, true );
}

如果$type类没有定义，就去导入。有些组件，核心在yii中多次create调用，这样就保证了仅在类文件首次引用时导入。

下面分析index.php中Yii::createWebApplication ( $config )的调用过程。

这个调用是去了CWebApplication。

<span> 1</span> <?<span>php
</span><span> 2</span> <span>class</span> CWebApplication <span>extends</span><span> CApplication {
</span><span> 3</span>     <span>public</span> <span>$controllerNamespace</span><span>;
</span><span> 4</span>     <span>private</span> <span>$_controllerPath</span><span>;
</span><span> 5</span>     <span>private</span> <span>$_viewPath</span><span>;
</span><span> 6</span>     <span>private</span> <span>$_systemViewPath</span><span>;
</span><span> 7</span>     <span>private</span> <span>$_controller</span><span>;
</span><span> 8</span>     <span>public</span> <span>$controllerMap</span>=<span>array</span><span>();
</span><span> 9</span>     <span>public</span> <span>function</span> processRequest() {<span>//</span><span>开始执行请求
</span><span>10</span> <span>        //获取urlManager组件，解析请求，得到controller/action这种格式的string,
</span><span>11</span> <span>        //并且将隐藏参数与请求的参数一一对应，匹配起来，写入$_REQUEST中</span>
<span>12</span>         <span>$route</span> = <span>$this</span>->getUrlManager ()->parseUrl (<span>$this</span>-><span>getRequest());
</span><span>13</span>         <span>$this</span>->runController ( <span>$route</span><span> );
</span><span>14</span> <span>    }
</span><span>15</span>     <span>public</span> <span>function</span> getRequest() {<span>//</span><span>获取request组件</span>
<span>16</span>         <span>return</span> <span>$this</span>->getComponent ( 'request'<span> );
</span><span>17</span> <span>    }
</span><span>18</span>     <span>protected</span> <span>function</span> registerCoreComponents() {<span>//</span><span>注册核心组件</span>
<span>19</span>         parent::<span>registerCoreComponents ();
</span><span>20</span> <span>    }
</span><span>21</span>     <span>//</span><span>执行contronller</span>
<span>22</span>     <span>public</span> <span>function</span> runController(<span>$route</span><span>) {
</span><span>23</span>         <span>if</span> ((<span>$ca</span> = <span>$this</span>->createController ( <span>$route</span> )) !== <span>null</span><span>) {
</span><span>24</span>             <span>list</span> ( <span>$controller</span>, <span>$actionID</span> ) = <span>$ca</span><span>;
</span><span>25</span>             <span>$oldController</span> = <span>$this</span>-><span>_controller;
</span><span>26</span>             <span>$this</span>->_controller = <span>$controller</span><span>;
</span><span>27</span>             <span>$controller</span>->init ();<span>//</span><span>钩子,在执行action方法前调用，子类去实现</span>
<span>28</span>             <span>$controller</span>->run ( <span>$actionID</span> );<span>//</span><span>开始转入controller类中action方法的执行</span>
<span>29</span>             <span>$this</span>->_controller = <span>$oldController</span><span>;
</span><span>30</span> <span>        }
</span><span>31</span> <span>    }
</span><span>32</span>     <span>//</span><span>创建controller类实例,从controller/action这种格式的string中解析出$controller, $actionID </span>
<span>33</span>     <span>public</span> <span>function</span> createController(<span>$route</span>, <span>$owner</span> = <span>null</span><span>) {
</span><span>34</span>         <span>if</span> (<span>$owner</span> === <span>null</span><span>)
</span><span>35</span>             <span>$owner</span> = <span>$this</span><span>;
</span><span>36</span>         <span>if</span> ((<span>$route</span> = <span>trim</span> ( <span>$route</span>, '/' )) === ''<span>)
</span><span>37</span>             <span>$route</span> = <span>$owner</span>-><span>defaultController;
</span><span>38</span> 
<span>39</span>         <span>$route</span> .= '/'<span>;
</span><span>40</span>         <span>while</span> ( (<span>$pos</span> = <span>strpos</span> ( <span>$route</span>, '/' )) !== <span>false</span><span> ) {
</span><span>41</span>             <span>$id</span> = <span>substr</span> ( <span>$route</span>, 0, <span>$pos</span><span> );
</span><span>42</span>             <span>if</span> (! <span>preg_match</span> ( '/^\w+$/', <span>$id</span><span> ))
</span><span>43</span>                 <span>return</span> <span>null</span><span>;
</span><span>44</span>             <span>$id</span> = <span>strtolower</span> ( <span>$id</span><span> );
</span><span>45</span>             <span>$route</span> = ( <span>string</span> ) <span>substr</span> ( <span>$route</span>, <span>$pos</span> + 1<span> );
</span><span>46</span>             <span>if</span> (! <span>isset</span> ( <span>$basePath</span> ))             <span>//</span><span> first segment</span>
<span>47</span> <span>            {
</span><span>48</span>                 <span>$basePath</span> = <span>$owner</span>-><span>getControllerPath ();
</span><span>49</span>                 <span>$controllerID</span> = ''<span>;
</span><span>50</span>             } <span>else</span><span> {
</span><span>51</span>                 <span>$controllerID</span> .= '/'<span>;
</span><span>52</span> <span>            }
</span><span>53</span>             <span>$className</span> = <span>ucfirst</span> ( <span>$id</span> ) . 'Controller'<span>;
</span><span>54</span>             <span>$classFile</span> = <span>$basePath</span> . DIRECTORY_SEPARATOR . <span>$className</span> . '.php'<span>;
</span><span>55</span> 
<span>56</span>             <span>if</span> (<span>is_file</span> ( <span>$classFile</span><span> )) {
</span><span>57</span>                 <span>if</span> (! <span>class_exists</span> ( <span>$className</span>, <span>false</span><span> ))
</span><span>58</span>                     <span>require</span> (<span>$classFile</span><span>);
</span><span>59</span>                 <span>if</span> (<span>class_exists</span> ( <span>$className</span>, <span>false</span> ) && <span>is_subclass_of</span> ( <span>$className</span>, 'CController'<span> )) {
</span><span>60</span>                     <span>$id</span> [0] = <span>strtolower</span> ( <span>$id</span> [0<span>] );
</span><span>61</span>                     <span>return</span> <span>array</span><span> (
</span><span>62</span>                             <span>new</span> <span>$className</span> ( <span>$controllerID</span> . <span>$id</span>, <span>$owner</span> === <span>$this</span> ? <span>null</span> : <span>$owner</span> ),
<span>63</span>                             <span>$this</span>->parseActionParams ( <span>$route</span><span> )
</span><span>64</span> <span>                    );
</span><span>65</span> <span>                }
</span><span>66</span>                 <span>return</span> <span>null</span><span>;
</span><span>67</span> <span>            }
</span><span>68</span>             <span>$controllerID</span> .= <span>$id</span><span>;
</span><span>69</span>             <span>$basePath</span> .= DIRECTORY_SEPARATOR . <span>$id</span><span>;
</span><span>70</span> <span>        }
</span><span>71</span> <span>    }
</span><span>72</span>     <span>protected</span> <span>function</span> parseActionParams(<span>$pathInfo</span><span>) {
</span><span>73</span>         <span>if</span> ((<span>$pos</span> = <span>strpos</span> ( <span>$pathInfo</span>, '/' )) !== <span>false</span><span>) {
</span><span>74</span>             <span>$manager</span> = <span>$this</span>->getUrlManager ();<span>//</span><span>再次获取urlManager,在上面第一次调用中已经导入。</span>
<span>75</span>             <span>$manager</span>->parsePathInfo ( ( <span>string</span> ) <span>substr</span> ( <span>$pathInfo</span>, <span>$pos</span> + 1<span> ) );
</span><span>76</span>             <span>$actionID</span> = <span>substr</span> ( <span>$pathInfo</span>, 0, <span>$pos</span><span> );
</span><span>77</span>             <span>return</span> <span>$manager</span>->caseSensitive ? <span>$actionID</span> : <span>strtolower</span> ( <span>$actionID</span><span> );
</span><span>78</span>         } <span>else</span>
<span>79</span>             <span>return</span> <span>$pathInfo</span><span>;
</span><span>80</span> <span>    }
</span><span>81</span>     <span>public</span> <span>function</span><span> getControllerPath() {
</span><span>82</span>         <span>if</span> (<span>$this</span>->_controllerPath !== <span>null</span><span>)
</span><span>83</span>             <span>return</span> <span>$this</span>-><span>_controllerPath;
</span><span>84</span>         <span>else</span>
<span>85</span>             <span>return</span> <span>$this</span>->_controllerPath = <span>$this</span>->getBasePath () . DIRECTORY_SEPARATOR . 'controllers'<span>;
</span><span>86</span> <span>    }
</span><span>87</span>     <span>//</span><span>两个钩子,子类去实现</span>
<span>88</span>     <span>public</span> <span>function</span> beforeControllerAction(<span>$controller</span>, <span>$action</span><span>) {
</span><span>89</span>         <span>return</span> <span>true</span><span>;
</span><span>90</span> <span>    }
</span><span>91</span>     <span>public</span> <span>function</span> afterControllerAction(<span>$controller</span>, <span>$action</span><span>) {
</span><span>92</span> <span>    }
</span><span>93</span>     <span>protected</span> <span>function</span><span> init() {
</span><span>94</span>         parent::<span>init ();
</span><span>95</span> <span>    }
</span><span>96</span> }

没有构造方法，构造方法在父类CApplication里面。

<span> 1</span> <?<span>php
</span><span> 2</span> <span>abstract</span> <span>class</span> CApplication <span>extends</span><span> CModule {
</span><span> 3</span>     <span>private</span> <span>$_id</span><span>;
</span><span> 4</span>     <span>private</span> <span>$_basePath</span><span>;
</span><span> 5</span>     <span>abstract</span> <span>public</span> <span>function</span><span> processRequest();
</span><span> 6</span>     <span>public</span> <span>function</span> __construct(<span>$config</span> = <span>null</span><span>) {
</span><span> 7</span>         <span>if</span> (<span>is_string</span> ( <span>$config</span><span> ))
</span><span> 8</span>             <span>$config</span> = <span>require</span> (<span>$config</span><span>);
</span><span> 9</span>         Yii::setApplication ( <span>$this</span> );<span>//</span><span>保存整个app实例</span>
<span>10</span>         <span>if</span> (<span>isset</span> ( <span>$config</span> ['basePath'<span>] )) {
</span><span>11</span>             <span>$this</span>->setBasePath ( <span>$config</span> ['basePath'<span>] );
</span><span>12</span>             <span>unset</span> ( <span>$config</span> ['basePath'<span>] );
</span><span>13</span>         } <span>else</span>
<span>14</span>             <span>$this</span>->setBasePath ( 'protected'<span> );
</span><span>15</span>         <span>//</span><span>设置别名,后面就可以用application表示basePath了</span>
<span>16</span>         Yii::setPathOfAlias ( 'application', <span>$this</span>-><span>getBasePath () );
</span><span>17</span>         <span>//</span><span>钩子，模块 预 初始化时执行，子类实现。不过这时，配置还没有写入框架</span>
<span>18</span>         <span>$this</span>-><span>preinit ();
</span><span>19</span>         <span>$this</span>-><span>registerCoreComponents ();
</span><span>20</span>         <span>//</span><span>父类实现</span>
<span>21</span>         <span>$this</span>->configure ( <span>$config</span><span> );
</span><span>22</span>         <span>//</span><span>加载静态应用组件</span>
<span>23</span>         <span>$this</span>-><span>preloadComponents ();
</span><span>24</span>         <span>//</span><span>这才开始初始化模块</span>
<span>25</span>         <span>$this</span>-><span>init ();
</span><span>26</span> <span>    }
</span><span>27</span>     <span>protected</span> <span>function</span><span> registerCoreComponents() {
</span><span>28</span>         <span>$components</span> = <span>array</span><span> (
</span><span>29</span>                 'request' => <span>array</span><span> (
</span><span>30</span>                         'class' => 'CHttpRequest'
<span>31</span>                 ),
<span>32</span>                 'urlManager' => <span>array</span><span> (
</span><span>33</span>                         'class' => 'CUrlManager'
<span>34</span> <span>                )
</span><span>35</span> <span>        );
</span><span>36</span> 
<span>37</span>         <span>$this</span>->setComponents ( <span>$components</span> );<span>//</span><span>父类实现</span>
<span>38</span> <span>    }
</span><span>39</span>     <span>public</span> <span>function</span><span> run() {
</span><span>40</span>         <span>$this</span>-><span>processRequest ();
</span><span>41</span> <span>    }
</span><span>42</span>     <span>public</span> <span>function</span><span> getId() {
</span><span>43</span>         <span>if</span> (<span>$this</span>->_id !== <span>null</span><span>)
</span><span>44</span>             <span>return</span> <span>$this</span>-><span>_id;
</span><span>45</span>         <span>else</span>
<span>46</span>             <span>return</span> <span>$this</span>->_id = <span>sprintf</span> ( '%x', <span>crc32</span> ( <span>$this</span>->getBasePath () . <span>$this</span>-><span>name ) );
</span><span>47</span> <span>    }
</span><span>48</span>     <span>public</span> <span>function</span> setId(<span>$id</span><span>) {
</span><span>49</span>         <span>$this</span>->_id = <span>$id</span><span>;
</span><span>50</span> <span>    }
</span><span>51</span>     <span>public</span> <span>function</span><span> getBasePath() {
</span><span>52</span>         <span>return</span> <span>$this</span>-><span>_basePath;
</span><span>53</span> <span>    }
</span><span>54</span>     <span>public</span> <span>function</span> setBasePath(<span>$path</span><span>) {
</span><span>55</span>         <span>if</span> ((<span>$this</span>->_basePath = <span>realpath</span> ( <span>$path</span> )) === <span>false</span> || ! <span>is_dir</span> ( <span>$this</span>-><span>_basePath ))
</span><span>56</span>             <span>return</span><span>;
</span><span>57</span> <span>    }
</span><span>58</span>     <span>public</span> <span>function</span><span> getDb() {
</span><span>59</span>         <span>return</span> <span>$this</span>->getComponent ( 'db' );<span>//</span><span>父类实现</span>
<span>60</span> <span>    }
</span><span>61</span>     <span>public</span> <span>function</span><span> getUrlManager() {
</span><span>62</span>         <span>return</span> <span>$this</span>->getComponent ( 'urlManager'<span> );
</span><span>63</span> <span>    }
</span><span>64</span>     <span>public</span> <span>function</span><span> getController() {
</span><span>65</span>         <span>return</span> <span>null</span><span>;
</span><span>66</span> <span>    }
</span><span>67</span>     <span>public</span> <span>function</span> getBaseUrl(<span>$absolute</span> = <span>false</span><span>) {
</span><span>68</span>         <span>return</span> <span>$this</span>->getRequest ()->getBaseUrl ( <span>$absolute</span><span> );
</span><span>69</span> <span>    }
</span><span>70</span> }

__construct里面注释写的很详细了，值得注意的是registerCoreComponents ()。前面说了那么多，那么Yii::createWebApplication ( $config )到底是做什么的。

其实最终目的对这个裁剪过的yii而言就是注册核心组件。就这么简单.

setComponents ( $components )在父类CModule里面.

<span> 1</span> <?<span>php
</span><span> 2</span> <span>abstract</span> <span>class</span> CModule <span>extends</span><span> CComponent {
</span><span> 3</span>     <span>public</span> <span>$preload</span> = <span>array</span><span> ();
</span><span> 4</span>     <span>public</span> <span>$behaviors</span> = <span>array</span><span> ();
</span><span> 5</span>     <span>private</span> <span>$_id</span><span>;
</span><span> 6</span>     <span>private</span> <span>$_parentModule</span><span>;
</span><span> 7</span>     <span>private</span> <span>$_basePath</span><span>;
</span><span> 8</span>     <span>private</span> <span>$_modulePath</span><span>;
</span><span> 9</span>     <span>private</span> <span>$_params</span><span>;
</span><span>10</span>     <span>private</span> <span>$_modules</span> = <span>array</span><span> ();
</span><span>11</span>     <span>private</span> <span>$_moduleConfig</span> = <span>array</span><span> ();
</span><span>12</span>     <span>private</span> <span>$_components</span> = <span>array</span><span> ();
</span><span>13</span>     <span>private</span> <span>$_componentConfig</span> = <span>array</span><span> ();
</span><span>14</span>     <span>//</span><span>重写是为了方便直接用 application.组件 这种方式直接获取组件</span>
<span>15</span>     <span>public</span> <span>function</span> __get(<span>$name</span><span>) {
</span><span>16</span>         <span>if</span> (<span>$this</span>->hasComponent ( <span>$name</span><span> ))
</span><span>17</span>             <span>return</span> <span>$this</span>->getComponent ( <span>$name</span><span> );
</span><span>18</span>         <span>else</span>
<span>19</span>             <span>return</span> parent::__get ( <span>$name</span><span> );
</span><span>20</span> <span>    }
</span><span>21</span>     <span>public</span> <span>function</span> __isset(<span>$name</span><span>) {
</span><span>22</span>         <span>if</span> (<span>$this</span>->hasComponent ( <span>$name</span><span> ))
</span><span>23</span>             <span>return</span> <span>$this</span>->getComponent ( <span>$name</span> ) !== <span>null</span><span>;
</span><span>24</span>         <span>else</span>
<span>25</span>             <span>return</span> parent::__isset ( <span>$name</span><span> );
</span><span>26</span> <span>    }
</span><span>27</span>     <span>public</span> <span>function</span> hasComponent(<span>$id</span><span>) {
</span><span>28</span>         <span>return</span> <span>isset</span> ( <span>$this</span>->_components [<span>$id</span>] ) || <span>isset</span> ( <span>$this</span>->_componentConfig [<span>$id</span><span>] );
</span><span>29</span> <span>    }
</span><span>30</span>     <span>//
</span><span>31</span>     <span>public</span> <span>function</span> getComponent(<span>$id</span>, <span>$createIfNull</span> = <span>true</span><span>) {
</span><span>32</span>         <span>if</span> (<span>isset</span> ( <span>$this</span>->_components [<span>$id</span><span>] ))
</span><span>33</span>             <span>return</span> <span>$this</span>->_components [<span>$id</span><span>];
</span><span>34</span>         <span>else</span> <span>if</span> (<span>isset</span> ( <span>$this</span>->_componentConfig [<span>$id</span>] ) && <span>$createIfNull</span><span>) {
</span><span>35</span>             <span>$config</span> = <span>$this</span>->_componentConfig [<span>$id</span><span>];
</span><span>36</span>             <span>$component</span> = Yii::createComponent ( <span>$config</span> );<span>//</span><span>YiiBase,返回组件实例</span>
<span>37</span>             <span>$component</span>->init ();<span>//</span><span>钩子，调用子类重写的init方法
</span><span>38</span> <span>            //将组件写入数组保存，并返回</span>
<span>39</span>             <span>return</span> <span>$this</span>->_components [<span>$id</span>] = <span>$component</span><span>;
</span><span>40</span> <span>        }
</span><span>41</span> <span>    }
</span><span>42</span>     <span>public</span> <span>function</span> setComponent(<span>$id</span>, <span>$component</span>, <span>$merge</span> = <span>true</span><span>) {
</span><span>43</span>         <span>//</span><span>组件写入数组保存</span>
<span>44</span>         <span>if</span> (<span>isset</span> ( <span>$this</span>->_componentConfig [<span>$id</span>] ) && <span>$merge</span><span>) {
</span><span>45</span>             
<span>46</span>             <span>$this</span>->_componentConfig [<span>$id</span>] = self::mergeArray ( <span>$this</span>->_componentConfig [<span>$id</span>], <span>$component</span><span> );
</span><span>47</span>         } <span>else</span><span> {
</span><span>48</span>             
<span>49</span>             <span>$this</span>->_componentConfig [<span>$id</span>] = <span>$component</span><span>;
</span><span>50</span> <span>        }
</span><span>51</span> <span>    }
</span><span>52</span>     <span>public</span> <span>static</span> <span>function</span> mergeArray(<span>$a</span>, <span>$b</span><span>) {
</span><span>53</span>         <span>$args</span> = <span>func_get_args</span><span> ();
</span><span>54</span>         <span>$res</span> = <span>array_shift</span> ( <span>$args</span><span> );
</span><span>55</span>         <span>while</span> ( ! <span>empty</span> ( <span>$args</span><span> ) ) {
</span><span>56</span>             <span>$next</span> = <span>array_shift</span> ( <span>$args</span><span> );
</span><span>57</span>             <span>foreach</span> ( <span>$next</span> <span>as</span> <span>$k</span> => <span>$v</span><span> ) {
</span><span>58</span>                 <span>if</span> (<span>is_integer</span> ( <span>$k</span><span> ))
</span><span>59</span>                     <span>isset</span> ( <span>$res</span> [<span>$k</span>] ) ? <span>$res</span> [] = <span>$v</span> : <span>$res</span> [<span>$k</span>] = <span>$v</span><span>;
</span><span>60</span>                 <span>elseif</span> (<span>is_array</span> ( <span>$v</span> ) && <span>isset</span> ( <span>$res</span> [<span>$k</span>] ) && <span>is_array</span> ( <span>$res</span> [<span>$k</span><span>] ))
</span><span>61</span>                     <span>$res</span> [<span>$k</span>] = self::mergeArray ( <span>$res</span> [<span>$k</span>], <span>$v</span><span> );
</span><span>62</span>                 <span>else</span>
<span>63</span>                     <span>$res</span> [<span>$k</span>] = <span>$v</span><span>;
</span><span>64</span> <span>            }
</span><span>65</span> <span>        }
</span><span>66</span>         <span>return</span> <span>$res</span><span>;
</span><span>67</span> <span>    }
</span><span>68</span>     <span>public</span> <span>function</span> setComponents(<span>$components</span>, <span>$merge</span> = <span>true</span><span>) {
</span><span>69</span>         <span>foreach</span> ( <span>$components</span> <span>as</span> <span>$id</span> => <span>$component</span><span> )
</span><span>70</span>             <span>$this</span>->setComponent ( <span>$id</span>, <span>$component</span>, <span>$merge</span><span> );
</span><span>71</span> <span>    }
</span><span>72</span>     <span>//</span><span>子类CApplication调用，用来为模块指定配置</span>
<span>73</span>     <span>public</span> <span>function</span> configure(<span>$config</span><span>) {
</span><span>74</span>         <span>if</span> (<span>is_array</span> ( <span>$config</span><span> )) {
</span><span>75</span>             <span>foreach</span> ( <span>$config</span> <span>as</span> <span>$key</span> => <span>$value</span><span> )
</span><span>76</span>                 <span>$this</span>-><span>$key</span> = <span>$value</span><span>;
</span><span>77</span> <span>        }
</span><span>78</span> <span>    }
</span><span>79</span>     <span>protected</span> <span>function</span><span> preloadComponents() {
</span><span>80</span>         <span>foreach</span> ( <span>$this</span>->preload <span>as</span> <span>$id</span><span> )
</span><span>81</span>             <span>$this</span>->getComponent ( <span>$id</span><span> );
</span><span>82</span> <span>    }
</span><span>83</span>     <span>//</span><span>又是两个钩子</span>
<span>84</span>     <span>protected</span> <span>function</span><span> preinit() {
</span><span>85</span> <span>    }
</span><span>86</span>     <span>protected</span> <span>function</span><span> init() {
</span><span>87</span> <span>    }
</span><span>88</span> }

看到所谓的注册组件就是写入数组保存，getComponent()的时候就是用前面讲到的YiiBase里面的createComponent($config)返回组件实例。就这么简单。

而CApplication里面的什么getDb()，getUrlManager()也是在调用getComponent()。

Statement

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The Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AM

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AM

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AM

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AM

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AM

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AM

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

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