$xmlObj = simplexml_load_string($xmlStr); $xmlArr = json_decode(json_encode($xmlObj) , true); 

<?php $b=3; switch(1){     case $b==3:         echo "fuck";         break; } ?> 

<?php function callback($callback) {       $callback();   }  $obj = (object) "php aaa";   $callback = function () use ($obj) {       print "This is a closure use object, msg is: {$obj->scalar}. <br />";   };   $obj->scalar = "php bbb";   //$obj = (object) "php bbb";   callback($callback); 

call_user_func(function(){         echo "hello,world"; }); 

$context="hello,world"; call_user_func(function()use($context){echo $context;}); 

class Contrller {  //...其他方法  public function view($template_name,$context=NULL,$isShow=true){     ob_start();     $that=$this;    //注意$this不能直接用于use     call_user_func(         //这里可以向视图文件传入参数         function()use($that,$template_name,$context){                 $view_path=$that->getViewPath($template_name);                 include $view_path;         }     }     $out=ob_get_contents();     ob_end_clean();     if($isShow){         echo $out;      }else{         return $out;     }  }    } 

class A {       public  $t;      public function  __construct($t="hello,world"){          $this->t=$t;      }       function test(){           call_user_func(function(){                  echo $this->t;          });      }    }    $a=new A();  $a->test(); 

class Contrller{        //调用具体的action，     public function __act($action){         call_user_func(             array($this,$action)          );      }  }  class HelloContrller extends Controller{       public function index(){     }      public function hello(){     }      public function dance(){     }  } 

 <?php   //装饰器  $dec=function($func) {      $wrap=function ()use ($func) {      echo "before calling you do sth
";      $func();      echo "after calling you can do sth too
 ";      };      return $wrap;  };   //执行某功能的函数  $hello=function (){      echo "hello
";  };  //装饰  $hello=$dec($hello);     //在其他地方调用经过装饰的原函数  $hello();   /*output: before calling you do sth hello after calling you can do sth too */  

<?php     http://www.zhihu.com ?> 

<?php  class A {     protected function pro()     {         return "pro";     }      public function pub()     {         return "pub";     } }  $a = new A(); $ext = function () {     var_dump($this);     // var_dump($this->pro()); //Error: Call to protected method A::pro()      var_dump($this->pub()); }; $ext = $ext->bindTo($a);  var_dump($ext()); 

<?php  $foo = "Hello"; $bar = "foo"; echo $$bar;