php从字符串创建函数的方法_php技巧

WBOY
Release: 2016-05-16 20:20:58
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本文实例讲述了php从字符串创建函数的方法。分享给大家供大家参考。具体如下:

php中可以把整个函数定义放到一个字符串内动态定义,有了create_function这个函数,你就可以根据用户输入动态创建函数了,非常方便,create_function使用方法如范例所示:

复制代码 代码如下:
$lambda =create_function('$a,$b','return(strlen($a)-strlen($b));');
$array = array('really long string here,boy', 'this', 'middling length','larger');
usort($array,$lambda);
print_r($array);
?>

希望本文所述对大家的php程序设计有所帮助。

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