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HomeBackend DevelopmentPHP TutorialPHP imitates tp to implement the basic design ideas and implementation methods of the mvc framework

这篇文章主要介绍了PHP仿tp实现mvc框架基本设计思路与实现方法,简单讲述了php实现tp框架的原理,并结合实例形式分析了相关控制器、视图及URL访问操作技巧与注意事项,需要的朋友可以参考下

本文实例讲述了PHP仿tp实现mvc框架基本设计思路与实现方法。分享给大家供大家参考,具体如下:

仿tp mvc基本设计与简单实现

一:文件加载常识

变量 常量 函数 类
文件加载的函数或者使用命名空间:require();   require_once();   include();   include_once();
常量:define("DEFINE","");   const constant = "value";
函数:function fun(){}  // global 使用全局变量    局部变量不被外部调用。
类:

<?php
class A{
  public $a = 10;
  public function aa(){  // 不能使用一个a是因为,new A 之后 方法a会被自动执行,所以方法名不可以和类名冲突。
    echo $this->a; // 输出属性.
  }
  public function __construct(){ // 构造方法,实例化后自动执行,
    echo $this->bb(); // 调用方法。
  }
  public function bb(){
    echo "我是bb";
  }
}
$a = new A;
$a->aa();
class B extends A{ // 继承 A ,类A是类B的父级。继承public的,
}
$b = new B;
$b->aa(); // 可以输出类A里面的属性。

工厂模式参阅:http://www.jb51.net/article/140658.htm

//-----------------------------工厂模式-------------------------//
class A{
  public $class;   // public $class = $_GET[&#39;c&#39;]; //类名
  public $method; // public $method = $_GET[&#39;m&#39;]; //方法
  public function __construct($class,$method){
    // 或者通过 $_SERVER[&#39;PATH_INFO&#39;]; 转换得到类名或者方法名(下面讲解)。
    $this->class = ucfirst(strtolower($class)).&#39;Controller&#39;; //对类名进行安全处理,并加上控制器后缀
    $this->method = strtolower($method);   //对方法名进行安全处理
    $this->work($this->class,$this->method);
  }
  public function work($class,$method){
    // 把文件命名成 (类名.class.php的形式),就可以通过类名找到文件。
    //include &#39;文件名(文件在别的地方)&#39;;    #例如 include &#39;./index.php&#39;; 引入文件然后实例化类。
    $c = new $class;  //实例化类
    $c->$method();  //访问类的方法
  }
}

至此我们可以通过url的 $_GET 参数来解决

例如:http://mvc.com/index.php?h=home&v=Index&c=index.html

h为前后台,v为控制器,c为模板。

$v = $_GET[&#39;v&#39;];
$c = rtrim($_GET[&#39;c&#39;],".html");
new A($v,$c); // 根据继承关系再次加载文件。
// extract($arr);  //extract 的作用:从数组中将变量导入到当前的符号表,键做变量,值做值!
// compact(); // — 建立一个数组,包括变量名和它们的值
// assign display 实现参阅:http://www.jb51.net/article/140661.htm

class Controller{
  public $array;
  public $key;
  public $val;
  public function assign($key,$val){
    if(array($val)){
      $this->array["$key"] = $val;
    }else{
      $this->array["$key"] = compact($val);
    }
  }
  public function display($tpl = &#39;&#39;){ // 模板为空自动加载。
    $this->assign($this->key,$this->val);
    extract($this->array);
    // 如果模板为空就在这里根据get参数添加或者通过 $_SERVER[&#39;PATH_INFO&#39;]; 转换得到。(下面讲解)
    if(file_exists($tpl)){ //模板存在就加载文件。
      include $tpl;
    }
  }
}
//继承总model。这个model名字和控制器model的名字是一样的。继承方法同Controller,总model必须需要加上一个return。数据处理的indexmodel可以加return,也可以不加。
class IndexModel extends Model{
  public function index(){
    // 数据处理。
    // 需要返回数据就加上return。
  }
}
class IndexController extends Controller{ // 继承
  public function index(){
    $m = Model("index");
    echo &#39;实例化后的index方法<br>&#39;;
    $this->assign(&#39;m&#39;,$m); // 分配数据。
    $this->display(&#39;index.html&#39;); // 模板
  }
}

mvc虽然实现但是不够人性化,因为每次都要加上get参数,变得很冗长,解决的关键在于$_SERVER['PATH_INFO'];

用这个替换掉h m v三个参数。

1. 当输入url为:http://mvc.com/index.php/home/index/index.html
    这种情况下  index.php 斜线后面的apache会自动认为是一个路径。
    $_SERVER['PATH_INFO'] =  /home/index/index.html
    第1个斜线 /home        前后台
    第2个斜线 /index        控制器
    第3个斜线 /index.html  模板文件
    如果后面加有参数例如:?a=18&b=38   他不会被加到$_SERVER['PATH_INFO']里面。$_POST 或者 $_GET 也不会加入$_SERVER['PATH_INFO']里面的内容,这样就可以让控制参数和数据的参数互不冲突。

2. U 方法的实现。重新改写$_SERVER['PATH_INFO'] 参数,改变为一个数据。array( 'home', 'Index', 'index');

每次进入入口文件index.php都把他的PHP_INFO参数转换为数组,在控制器或者其他的地方只要调用这个参数就行了。

// 这里如果做了大小写的转换,总控制器里面就不用了。
function bca(){
  $arr = explode(&#39;/&#39;,ltrim($_SERVER[&#39;PATH_INFO&#39;],&#39;/&#39;));
  if(count($arr) == 3){
    $arr[0] = strtolower($arr[0]);
    $arr[1] = ucfirst(strtolower($arr[1]));
    // 判断后缀是不是 .html
    if(substr($arr[2],-5,strlen($arr[2])) == &#39;.html&#39;){
      $a = explode(&#39;.&#39;,$arr[&#39;2&#39;]);
      $arr[2] = strtolower($a[0]);
    }else{
      $arr[2] = strtolower($arr[2]);
    }
    $_SERVER[&#39;PATH_INFO&#39;] = $arr;
  }
}
// url方法做控制器或前后台的跳转。第三个参数是输出还是return。默认是直接输出。
function U($string = &#39;&#39;,$method = &#39;&#39;,$bool = true){ // true 是直接输出或者返回,
  // 获取系统变量。
  $path_info = $_SERVER[&#39;PATH_INFO&#39;];
  $script_name = $_SERVER[&#39;SCRIPT_NAME&#39;];
  // 判断中间有没有 / 以确定参数个数。
  if(strpos($string,&#39;/&#39;)){
    $arr = explode(&#39;/&#39;,$string);
    if(count($arr) == 2){  // 两个参数的情况。
      $arr[0] = ucfirst(strtolower($arr[0]));
      $arr[1] = strtolower($arr[1]);
      $url = "/{$path_info[0]}/{$arr[0]}/{$arr[1]}.html";
    }else if(count($arr) == 3){ // 三个参数的情况。
      $arr[0] = strtolower($arr[0]);
      $arr[1] = ucfirst(strtolower($arr[1]));
      $arr[2] = strtolower($arr[2]);
      $url = "/{$arr[0]}/{$arr[1]}/{$arr[2]}.html";
    }
  }else{
    $arr = strtolower($string); // 一个参数的情况。
    $url = "/{$path_info[0]}/{$path_info[1]}/{$arr}.html";
  }
  // url 路径的拼接。
  if($method != &#39;&#39;){
    $u = $script_name.$url.&#39;?&#39;.$method;
    if($bool == true){     echo $u;    }else{     return $u;   }
  }else{
    $u = $script_name.$url;
    if($bool == true){     echo $u;    }else{     return $u;   }
  }
}

3. url重写,去掉 index.php

打开apache配置文件重写模块,LoadModule rewrite_module modules/mod_rewrite.so

根下加入的改写文件  .htaccess

内容:

<IfModule mod_rewrite.c>
 Options +FollowSymlinks
 RewriteEngine On
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteRule ^(.*)$ index.php/$1 [QSA,PT,L]
</IfModule>

在浏览器输入url:http://mvc.com/home/index/index.html?a=19b=38
    [REDIRECT_STATUS] => 200  重写状态ok。

发现 $_SERVER['REDIRECT_URL'];$_SERVER['PATH_INFO']; 参数相同。所以参数后面就可以去掉index.php这安全的问题。

4. 模板替换(思路)

我们会发现有一个我们书写的模板,里面有 {$arr}  等,我们把模板文件读取后通过正则还有字符串把他转换成正常的php文件。对文件名加密后放到替换后的文件夹下,每次url访问的时候查看是否有缓存文件,判断最后修改时间等验证,

5. 数据缓存(思路)

json_encode() json_decode() file_get_contents() file_put_contents(); unserialize();  serialize(); 等存文文件里面或者memcache redis 等存储。

相关推荐:

ThinkPHP框架实现的MySQL数据库备份功能

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