做过PHP开发的程序员应该清楚,PHP中有很多内置的功能,掌握了它们,可以帮助你在做PHP开发时更加得心应手,本文将分享8个开发必备的PHP功能,个个都非常实用,希望各位PHP开发者能够掌握。
1、传递任意数量的函数参数
2、使用glob()查找文件
3、获取内存使用情况信息
4、获取CPU使用情况信息
5、获取系统常量
6、生成唯一的id
7、序列化
8、字符串压缩
1、传递任意数量的函数参数 我们在.NET或者JAVA编程中,一般函数参数个数都是固定的,但是PHP允许你使用任意个数的参数。下面这个示例向你展示了PHP函数的默认参数:
<span 1</span> <span //</span><span 两个默认参数的函数 </span> <span 2</span> <span function</span> foo(<span $arg1</span> = ", <span $arg2</span> =<span ") { </span><span 3</span> <span echo</span> "arg1: <span $arg1</span><span \n"; </span><span 4</span> <span echo</span> "arg2: <span $arg2</span><span \n"; </span><span 5</span> <span } </span><span 6</span> foo('hello','<span world'); </span><span 7</span> <span /* 输出: </span><span 8</span> <span arg1: hello </span><span 9</span> <span arg2: world </span><span 10</span> <span */ </span><span 11</span> <span foo(); </span><span 12</span> <span /* 输出: </span><span 13</span> <span arg1: </span><span 14</span> <span arg2: </span><span 15</span> <span */ </span><span 16</span> <span 下面这个示例是PHP的不定参数用法,其使用到了 func_get_args()方法: </span><span 17</span> <span // 是的,形参列表为空 </span><span 18</span> <span function foo() { </span><span 19</span> <span // 取得所有的传入参数的数组 </span><span 20</span> <span $args = func_get_args(); </span><span 21</span> <span foreach ($args as $k => $v) { </span><span 22</span> <span echo "arg".($k+1).": $v\n"; </span><span 23</span> <span } </span><span 24</span> <span } </span><span 25</span> <span foo(); </span><span 26</span> <span /* 什么也不会输出 */ </span><span 27</span> <span foo('hello'); </span><span 28</span> <span /* 输出 </span><span 29</span> <span arg1: hello </span><span 30</span> <span */ </span><span 31</span> <span foo('hello', 'world', 'again'); </span><span 32</span> <span /* 输出 </span><span 33</span> <span arg1: hello </span><span 34</span> <span arg2: world </span><span 35</span> <span arg3: again </span><span 36</span> */
2、使用glob()查找文件 大部分PHP函数的函数名从字面上都可以理解其用途,但是当你看到 glob() 的时候,你也许并不知道这是用来做什么的,其实glob()和scandir() 一样,可以用来查找文件,请看下面的用法:
<span 1</span> <span //</span><span 取得所有的后缀为PHP的文件 </span> <span 2</span> <span $files</span> = <span glob</span>('*.<span php'); </span><span 3</span> <span print_r</span>(<span $files</span><span ); </span><span 4</span> <span /*</span><span 输出: </span><span 5</span> <span Array </span><span 6</span> <span ( </span><span 7</span> <span [0] => phptest.php </span><span 8</span> <span [1] => pi.php </span><span 9</span> <span [2] => post_output.php </span><span 10</span> <span [3] => test.php </span><span 11</span> <span ) </span><span 12</span> <span */</span>
你还可以查找多种后缀名:
<span 1</span> <span //</span><span 取PHP文件和TXT文件 </span> <span 2</span> <span $files</span> = <span glob</span>('*.{php,txt}',<span GLOB_BRACE); </span><span 3</span> <span print_r</span>(<span $files</span><span ); </span><span 4</span> <span /*</span><span 输出: </span><span 5</span> <span Array </span><span 6</span> <span ( </span><span 7</span> <span [0] => phptest.php </span><span 8</span> <span [1] => pi.php </span><span 9</span> <span [2] => post_output.php </span><span 10</span> <span [3] => test.php </span><span 11</span> <span [4] => log.txt </span><span 12</span> <span [5] => test.txt </span><span 13</span> <span ) </span><span 14</span> <span */</span>
你还可以加上路径:
<span 1</span> <span $files</span> = <span glob</span>('../images/a*.<span jpg'); </span><span 2</span> <span print_r</span>(<span $files</span><span ); </span><span 3</span> <span /*</span><span 输出: </span><span 4</span> <span Array </span><span 5</span> <span ( </span><span 6</span> <span [0] => ../images/apple.jpg </span><span 7</span> <span [1] => ../images/art.jpg </span><span 8</span> <span ) </span><span 9</span> <span */</span>
如果你想得到绝对路径,你可以调用 realpath() 函数:
<span 1</span> <span $files</span> = <span glob</span>('../images/a*.<span jpg'); </span><span 2</span> <span //</span><span applies the function to each array element </span> <span 3</span> <span $files</span> = <span array_map</span>('<span realpath</span>',<span $files</span><span ); </span><span 4</span> <span print_r</span>(<span $files</span><span ); </span><span 5</span> <span /*</span><span output looks like: </span><span 6</span> <span Array </span><span 7</span> <span ( </span><span 8</span> <span [0] => C:\wamp\www\images\apple.jpg </span><span 9</span> <span [1] => C:\wamp\www\images\art.jpg </span><span 10</span> <span ) </span><span 11</span> <span */</span>
3、获取内存使用情况信息 PHP的内存回收机制已经非常强大,你也可以使用PHP脚本获取当前内存的使用情况,调用memory_get_usage() 函数获取当期内存使用情况,调用memory_get_peak_usage() 函数获取内存使用的峰值。参考代码如下:
<span 1</span> <span echo</span> "Initial: ".memory_get_usage().<span " bytes \n"; </span><span 2</span> <span /*</span><span 输出 </span><span 3</span> <span Initial: 361400 bytes </span><span 4</span> <span */</span> <span 5</span> <span //</span><span 使用内存 </span> <span 6</span> <span for</span> (<span $i</span> = 0; <span $i</span> < 100000; <span $i</span>++<span ) { </span><span 7</span> <span $array</span> []= <span md5</span>(<span $i</span><span ); </span><span 8</span> <span } </span><span 9</span> <span //</span><span 删除一半的内存 </span> <span 10</span> <span for</span> (<span $i</span> = 0; <span $i</span> < 100000; <span $i</span>++<span ) { </span><span 11</span> <span unset</span>(<span $array</span>[<span $i</span><span ]); </span><span 12</span> <span } </span><span 13</span> <span echo</span> "<span Final</span>: ".memory_get_usage().<span " bytes \n"; </span><span 14</span> <span /*</span><span prints </span><span 15</span> <span Final: 885912 bytes </span><span 16</span> <span */</span> <span 17</span> <span echo</span> "Peak: ".memory_get_peak_usage().<span " bytes \n"; </span><span 18</span> <span /*</span><span 输出峰值 </span><span 19</span> <span Peak: 13687072 bytes </span><span 20</span> <span */</span>
4、获取CPU使用情况信息 获取了内存使用情况,也可以使用PHP的 getrusage()获取CPU使用情况,该方法在windows下不可用。
<span 1</span> <span print_r</span><span (getrusage()); </span><span 2</span> <span /*</span><span 输出 </span><span 3</span> <span Array </span><span 4</span> <span ( </span><span 5</span> <span [ru_oublock] => 0 </span><span 6</span> <span [ru_inblock] => 0 </span><span 7</span> <span [ru_msgsnd] => 2 </span><span 8</span> <span [ru_msgrcv] => 3 </span><span 9</span> <span [ru_maxrss] => 12692 </span><span 10</span> <span [ru_ixrss] => 764 </span><span 11</span> <span [ru_idrss] => 3864 </span><span 12</span> <span [ru_minflt] => 94 </span><span 13</span> <span [ru_majflt] => 0 </span><span 14</span> <span [ru_nsignals] => 1 </span><span 15</span> <span [ru_nvcsw] => 67 </span><span 16</span> <span [ru_nivcsw] => 4 </span><span 17</span> <span [ru_nswap] => 0 </span><span 18</span> <span [ru_utime.tv_usec] => 0 </span><span 19</span> <span [ru_utime.tv_sec] => 0 </span><span 20</span> <span [ru_stime.tv_usec] => 6269 </span><span 21</span> <span [ru_stime.tv_sec] => 0 </span><span 22</span> <span ) </span><span 23</span> <span */</span>
这个结构看上出很晦涩,除非你对CPU很了解。下面一些解释: ru_oublock: 块输出操作 ru_inblock: 块输入操作 ru_msgsnd: 发送的message ru_msgrcv: 收到的message ru_maxrss: 最大驻留集大小 ru_ixrss: 全部共享内存大小 ru_idrss:全部非共享内存大小 ru_minflt: 页回收 ru_majflt: 页失效 ru_nsignals: 收到的信号 ru_nvcsw: 主动上下文切换 ru_nivcsw: 被动上下文切换 ru_nswap: 交换区 ru_utime.tv_usec: 用户态时间 (microseconds) ru_utime.tv_sec: 用户态时间(seconds) ru_stime.tv_usec: 系统内核时间 (microseconds) ru_stime.tv_sec: 系统内核时间?(seconds) 要看到你的脚本消耗了多少CPU,我们需要看看"用户态的时间"和"系统内核时间"的值。秒和微秒部分是分别提供的,您可以把微秒值除以100万,并把它添加到秒的值后,可以得到有小数部分的秒数。
<span 1</span> <span //</span><span sleep for 3 seconds (non-busy) </span> <span 2</span> <span sleep</span>(3<span ); </span><span 3</span> <span $data</span> =<span getrusage(); </span><span 4</span> <span echo</span> "User <span time</span>: ". <span 5</span> (<span $data</span>['ru_utime.tv_sec'] + <span 6</span> <span $data</span>['ru_utime.tv_usec'] / 1000000<span ); </span><span 7</span> <span echo</span> "<span System</span> <span time</span>: ". <span 8</span> (<span $data</span>['ru_stime.tv_sec'] + <span 9</span> <span $data</span>['ru_stime.tv_usec'] / 1000000<span ); </span><span 10</span> <span /*</span><span 输出 </span><span 11</span> <span User time: 0.011552 </span><span 12</span> <span System time: 0 </span><span 13</span> <span */</span>
是不占用系统时间的,我们可以来看下面的一个例子:
<span 1</span> <span //</span><span loop 10 million times (busy) </span> <span 2</span> <span for</span>(<span $i</span>=0;<span $i</span><10000000;<span $i</span>++<span ) { </span><span 3</span> <span } </span><span 4</span> <span $data</span> =<span getrusage(); </span><span 5</span> <span echo</span> "User <span time</span>: ". <span 6</span> (<span $data</span>['ru_utime.tv_sec'] + <span 7</span> <span $data</span>['ru_utime.tv_usec'] / 1000000<span ); </span><span 8</span> <span echo</span> "<span System</span> <span time</span>: ". <span 9</span> (<span $data</span>['ru_stime.tv_sec'] + <span 10</span> <span $data</span>['ru_stime.tv_usec'] / 1000000<span ); </span><span 11</span> <span /*</span><span 输出 </span><span 12</span> <span User time: 1.424592 </span><span 13</span> <span System time: 0.004204 </span><span 14</span> <span */</span>
这花了大约14秒的CPU时间,几乎所有的都是用户的时间,因为没有系统调用。传统时间是CPU花费在系统调用上的上执行内核指令的时间。下面是一个例子:
<span 1</span> <span $start</span> = <span microtime</span>(<span true</span><span ); </span><span 2</span> <span //</span><span keep calling microtime for about 3 seconds </span> <span 3</span> <span while</span>(<span microtime</span>(<span true</span>) – <span $start</span> < 3<span ) { </span><span 4</span> <span } </span><span 5</span> <span $data</span> =<span getrusage(); </span><span 6</span> <span echo</span> "User <span time</span>: ". <span 7</span> (<span $data</span>['ru_utime.tv_sec'] + <span 8</span> <span $data</span>['ru_utime.tv_usec'] / 1000000<span ); </span><span 9</span> <span echo</span> "<span System</span> <span time</span>: ". <span 10</span> (<span $data</span>['ru_stime.tv_sec'] + <span 11</span> <span $data</span>['ru_stime.tv_usec'] / 1000000<span ); </span><span 12</span> <span /*</span><span prints </span><span 13</span> <span User time: 1.088171 </span><span 14</span> <span System time: 1.675315 </span><span 15</span> <span */</span>
我们可以看到上面这个例子更耗CPU。
5、获取系统常量 PHP 提供非常有用的系统常量 可以让你得到当前的行号 (__LINE__),文件 (__FILE__),目录 (__DIR__),函数名 (__FUNCTION__),类名(__CLASS__),方法名(__METHOD__) 和名字空间 (__NAMESPACE__),很像C语言。
我们可以以为这些东西主要是用于调试,当也不一定,比如我们可以在include其它文件的时候使用?__FILE__ (当然,你也可以在 PHP 5.3以后使用 __DIR__ ),下面是一个例子。
<span 1</span> <span //</span><span this is relative to the loaded script's path </span><span 2</span> <span // it may cause problems when running scripts from different directories </span> <span 3</span> <span require_once</span>('config/database.<span php'); </span><span 4</span> <span //</span><span this is always relative to this file's path </span><span 5</span> <span // no matter where it was included from </span> <span 6</span> <span require_once</span>(<span dirname</span>(<span __FILE__</span>) . '/config/database.php');
下面是使用 __LINE__ 来输出一些debug的信息,这样有助于你调试程序:
<span 1</span> <span //</span><span some code </span><span 2</span> <span // … </span> <span 3</span> my_debug("some debug message", <span __LINE__</span><span ); </span><span 4</span> <span /*</span><span 输出 </span><span 5</span> <span Line 4: some debug message </span><span 6</span> <span */</span> <span 7</span> <span //</span><span some more code </span><span 8</span> <span // … </span> <span 9</span> my_debug("another debug message", <span __LINE__</span><span ); </span><span 10</span> <span /*</span><span 输出 </span><span 11</span> <span Line 11: another debug message </span><span 12</span> <span */</span> <span 13</span> <span function</span> my_debug(<span $msg</span>, <span $line</span><span ) { </span><span 14</span> <span echo</span> "Line <span $line</span>: <span $msg</span><span \n"; </span><span 15</span> }
6、生成唯一的id 很多朋友都利用md5()来生成唯一的编号,但是md5()有几个缺点:1、无序,导致数据库中排序性能下降。2、太长,需要更多的存储空间。其实PHP中自带一个函数来生成唯一的id,这个函数就是uniqid()。下面是用法:
<span 1</span> <span //</span><span generate unique string </span> <span 2</span> <span echo</span> <span uniqid</span><span (); </span><span 3</span> <span /*</span><span 输出 </span><span 4</span> <span 4bd67c947233e </span><span 5</span> <span */</span> <span 6</span> <span //</span><span generate another unique string </span> <span 7</span> <span echo</span> <span uniqid</span><span (); </span><span 8</span> <span /*</span><span 输出 </span><span 9</span> <span 4bd67c9472340 </span><span 10</span> <span */</span>
该算法是根据CPU时间戳来生成的,所以在相近的时间段内,id前几位是一样的,这也方便id的排序,如果你想更好的避免重复,可以在id前加上前缀,如:
<span 1</span> <span //</span><span 前缀 </span> <span 2</span> <span echo</span> <span uniqid</span><span ('foo_'); </span><span 3</span> <span /*</span><span 输出 </span><span 4</span> <span foo_4bd67d6cd8b8f </span><span 5</span> <span */</span> <span 6</span> <span //</span><span 有更多的熵 </span> <span 7</span> <span echo</span> <span uniqid</span>(",<span true</span><span ); </span><span 8</span> <span /*</span><span 输出 </span><span 9</span> <span 4bd67d6cd8b926.12135106 </span><span 10</span> <span */</span> <span 11</span> <span //</span><span 都有 </span> <span 12</span> <span echo</span> <span uniqid</span>('bar_',<span true</span><span ); </span><span 13</span> <span /*</span><span 输出 </span><span 14</span> <span bar_4bd67da367b650.43684647 </span><span 15</span> <span */</span>
7、序列化 PHP序列化功能大家可能用的比较多,也比较常见,当你需要把数据存到数据库或者文件中是,你可以利用PHP中的serialize() 和 unserialize()方法来实现序列化和反序列化,代码如下:
<span 1</span> <span //</span><span 一个复杂的数组 </span> <span 2</span> <span $myvar</span> = <span array</span><span ( </span><span 3</span> 'hello', <span 4</span> 42, <span 5</span> <span array</span>(1,'two'), <span 6</span> <span 'apple' </span><span 7</span> <span ); </span><span 8</span> <span //</span><span 序列化 </span> <span 9</span> <span $string</span> = <span serialize</span>(<span $myvar</span><span ); </span><span 10</span> <span echo</span> <span $string</span><span ; </span><span 11</span> <span /*</span><span 输出 </span><span 12</span> <span a:4:{i:0;s:5:"hello";i:1;i:42;i:2;a:2:{i:0;i:1;i:1;s:3:"two";}i:3;s:5:"apple";} </span><span 13</span> <span */</span> <span 14</span> <span //</span><span 反序例化 </span> <span 15</span> <span $newvar</span> = <span unserialize</span>(<span $string</span><span ); </span><span 16</span> <span print_r</span>(<span $newvar</span><span ); </span><span 17</span> <span /*</span><span 输出 </span><span 18</span> <span Array </span><span 19</span> <span ( </span><span 20</span> <span [0] => hello </span><span 21</span> <span [1] => 42 </span><span 22</span> <span [2] => Array </span><span 23</span> <span ( </span><span 24</span> <span [0] => 1 </span><span 25</span> <span [1] => two </span><span 26</span> <span ) </span><span 27</span> <span [3] => apple </span><span 28</span> <span ) </span><span 29</span> <span */</span>
如何序列化成json格式呢,放心,php也已经为你做好了,使用php 5.2以上版本的用户可以使用json_encode() 和 json_decode() 函数来实现json格式的序列化,代码如下:
<span 1</span> <span //</span><span a complex array </span> <span 2</span> <span $myvar</span> = <span array</span><span ( </span><span 3</span> 'hello', <span 4</span> 42, <span 5</span> <span array</span>(1,'two'), <span 6</span> <span 'apple' </span><span 7</span> <span ); </span><span 8</span> <span //</span><span convert to a string </span> <span 9</span> <span $string</span> = json_encode(<span $myvar</span><span ); </span><span 10</span> <span echo</span> <span $string</span><span ; </span><span 11</span> <span /*</span><span prints </span><span 12</span> <span ["hello",42,[1,"two"],"apple"] </span><span 13</span> <span */</span> <span 14</span> <span //</span><span you can reproduce the original variable </span> <span 15</span> <span $newvar</span> = json_decode(<span $string</span><span ); </span><span 16</span> <span print_r</span>(<span $newvar</span><span ); </span><span 17</span> <span /*</span><span prints </span><span 18</span> <span Array </span><span 19</span> <span ( </span><span 20</span> <span [0] => hello </span><span 21</span> <span [1] => 42 </span><span 22</span> <span [2] => Array </span><span 23</span> <span ( </span><span 24</span> <span [0] => 1 </span><span 25</span> <span [1] => two </span><span 26</span> <span ) </span><span 27</span> <span [3] => apple </span><span 28</span> <span ) </span><span 29</span> <span */</span>
8、字符串压缩 当我们说到压缩,我们可能会想到文件压缩,其实,字符串也是可以压缩的。PHP提供了 gzcompress() 和gzuncompress() 函数:
<span 1</span> <span $string</span> = <span 2</span> "Lorem ipsum dolor sit amet,<span consectetur </span><span 3</span> adipiscing elit.<span Nunc ut elit id mi ultricies </span><span 4</span> adipiscing. Nulla facilisi. Praesent pulvinar, <span 5</span> sapien vel feugiat vestibulum, nulla dui pretium orci, <span 6</span> non ultricies elit lacus quis ante.<span Lorem ipsum dolor </span><span 7</span> sit amet, consectetur adipiscing elit.<span Aliquam </span><span 8</span> pretium ullamcorper urna quis iaculis.<span Etiam ac massa </span><span 9</span> sed turpis tempor luctus.<span Curabitur sed nibh eu elit </span><span 10</span> mollis congue. Praesent ipsum diam,<span consectetur vitae </span><span 11</span> ornare a, aliquam a nunc.<span In id magna pellentesque </span><span 12</span> tellus posuere adipiscing. Sed non mi metus,<span at lacinia </span><span 13</span> augue. Sed magna nisi, ornare in mollis in,<span mollis </span><span 14</span> sed nunc. Etiam at justo in leo congue mollis. <span 15</span> <span Nullam in neque eget metus hendrerit scelerisque </span><span 16</span> eu non enim.<span Ut malesuada lacus eu nulla bibendum </span><span 17</span> id euismod urna sodales.<span "; </span><span 18</span> <span $compressed</span> = <span gzcompress</span>(<span $string</span><span ); </span><span 19</span> <span echo</span> "Original size: ". <span strlen</span>(<span $string</span>).<span "\n"; </span><span 20</span> <span /*</span><span 输出原始大小 </span><span 21</span> <span Original size: 800 </span><span 22</span> <span */</span> <span 23</span> <span echo</span> "Compressed size: ". <span strlen</span>(<span $compressed</span>).<span "\n"; </span><span 24</span> <span /*</span><span 输出压缩后的大小 </span><span 25</span> <span Compressed size: 418 </span><span 26</span> <span */</span> <span 27</span> <span //</span><span 解压缩 </span> <span 28</span> <span $original</span> = <span gzuncompress</span>(<span $compressed</span>);
几乎有50% 压缩比率。同时,你还可以使用 gzencode() 和 gzdecode() 函数来压缩,只不用其用了不同的压缩算法。
以上就是8个开发必备的PHP功能,是不是都很实用呢?
原文出处:http://www.codeceo.com/8-php-functions.html

PHPSession失效的原因包括配置错误、Cookie问题和Session过期。1.配置错误:检查并设置正确的session.save_path。2.Cookie问题:确保Cookie设置正确。3.Session过期:调整session.gc_maxlifetime值以延长会话时间。

在PHP中调试会话问题的方法包括:1.检查会话是否正确启动;2.验证会话ID的传递;3.检查会话数据的存储和读取;4.查看服务器配置。通过输出会话ID和数据、查看会话文件内容等方法,可以有效诊断和解决会话相关的问题。

多次调用session_start()会导致警告信息和可能的数据覆盖。1)PHP会发出警告,提示session已启动。2)可能导致session数据意外覆盖。3)使用session_status()检查session状态,避免重复调用。

在PHP中配置会话生命周期可以通过设置session.gc_maxlifetime和session.cookie_lifetime来实现。1)session.gc_maxlifetime控制服务器端会话数据的存活时间,2)session.cookie_lifetime控制客户端cookie的生命周期,设置为0时cookie在浏览器关闭时过期。

使用数据库存储会话的主要优势包括持久性、可扩展性和安全性。1.持久性:即使服务器重启,会话数据也能保持不变。2.可扩展性:适用于分布式系统,确保会话数据在多服务器间同步。3.安全性:数据库提供加密存储,保护敏感信息。

在PHP中实现自定义会话处理可以通过实现SessionHandlerInterface接口来完成。具体步骤包括:1)创建实现SessionHandlerInterface的类,如CustomSessionHandler;2)重写接口中的方法(如open,close,read,write,destroy,gc)来定义会话数据的生命周期和存储方式;3)在PHP脚本中注册自定义会话处理器并启动会话。这样可以将数据存储在MySQL、Redis等介质中,提升性能、安全性和可扩展性。

SessionID是网络应用程序中用来跟踪用户会话状态的机制。1.它是一个随机生成的字符串,用于在用户与服务器之间的多次交互中保持用户的身份信息。2.服务器生成并通过cookie或URL参数发送给客户端,帮助在用户的多次请求中识别和关联这些请求。3.生成通常使用随机算法保证唯一性和不可预测性。4.在实际开发中,可以使用内存数据库如Redis来存储session数据,提升性能和安全性。

在无状态环境如API中管理会话可以通过使用JWT或cookies来实现。1.JWT适合无状态和可扩展性,但大数据时体积大。2.Cookies更传统且易实现,但需谨慎配置以确保安全性。


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