php动态创建函数实例学习

<?php 
    $func = 'test'; 
     
    function test(){ 
        echo 'yes !'; 
    } 
     
    $func(); 
?> 
 

<?php 
    $newfunc = create_function('$a,$b', 'return $a.$b;'); 
    echo "New anonymous function: $newfunc<br>"; 
    echo $newfunc('just', 'coding'); 
?> 
 

<?php    
    //5.3 以前    
    $array = array( 'asbc', 'ddd', 'tttt', 'qqq');    
    array_walk($array,create_function('&$item','$item=strtoupper($item);') ); //function(&$itm){$itm = strtoupper($itm);}    
    print_r($array); 
     
    //5.3 以后    
    $array = array( 'asbc', 'ddd', 'tttt', 'qqq');    
    array_walk($array,function(&$itm){$itm = strtoupper($itm);});     
    print_r($array); 
?> 
 

<?php 
    /* create class */ 
    class Record { 
       
        /* record information will be held in here */ 
        private $info; 
       
        /* constructor */ 
        function Record($record_array) { 
            $record_array['body'] = 'this is a new attribution'; 
            $this->info = $record_array; 
        } 
       
        /* dynamic function server */ 
        function __call($method,$arguments) { 
            $meth = $this->from_case(substr($method,3,strlen($method)-3)); 
            return array_key_exists($meth,$this->info) ? $this->info[$meth] : false; 
        } 
       
        function from_case($str) { 
            $str[0] = strtolower($str[0]); 
            $func = create_function('$c', 'return "_" . strtolower($c[1]);'); // function ($c) { return "_" . strtolower($c[1]); } 
            return preg_replace_callback('/([A-Z])/', $func, $str); 
        }   
    }  //by http://www.jb200.com

    /* usage */ 
    $Record = new Record( 
        array( 
            'id' => 12, 
            'title' => 'Greatest Hits', 
            'description' => 'The greatest hits from the best band in the world!' 
        ) 
    ); 
     
    /* proof it works! */ 
    echo 'The ID is:  '.$Record->getId().'<br>'; // returns 12   
    echo 'The Title is:  '.$Record->getTitle().'<br>'; // returns "Greatest Hits" 
    echo 'The Description is:  '.$Record->getDescription().'<br>'; //returns "The greatest hits from the best band in the world!" 
    echo 'The Body is:  '.$Record->getBody(); //returns "The greatest hits from the best band in the world!" 
?>