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  • php 理解

    <?php
    class t
    {
    var $num;
    var $dynamic_function;
    public function dynamic_function()
    {
    $func = $this->dynamic_function;
    $func($this); 
    }
    }
    $p = new t();
    $p->num = 5;
    $p->dynamic_function = function($this_ref) 
    {
    echo $this_ref->num++.'<br />';
    };
    $p->dynamic_function(); 
    $p->dynamic_function = function($this_ref)
    {
    echo $this_ref->num.'<br />';
    $this_ref->num *= 3;
    };
    $p->dynamic_function(); 
    $p->dynamic_function(); 
    $p->dynamic_function(); 
    echo $p->num;
    
    
    /*
    5
    6
    18
    54
    162
    */
    ?>
    

      

      session_start();
    $authorise = function($func) {
         return function() use ($func) {
             if ($_SESSION['is_authorised'] == true) {
                 $args = func_get_args($func);
                 call_user_func_array($func, $args);
             }
             else {
                 echo "Access Denied";
             }
         };
     };
    
    $a = function($foo)  {
         echo "Service returns: $foo";
     };
    
    $service = $authorise($a);
    
    $_SESSION['is_authorised'] = true;
    $service('123',"2222222");
    
    
    $_SESSION['is_authorised'] = false;
    $service('test 2');
    

      

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  • 原文地址:https://www.cnblogs.com/saonian/p/5312409.html
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