本文实例分析了PHP程序设计中闭包的概念机用法,分享给大家供大家参考。具体分析如下:
通常来说,闭包也就是PHP的匿名函数, 但是和函数不同的是,闭包可以通过use使用函数声明时所在作用域的变量的值。
具体形式如下:
$a = function($arg1, $arg2) use ($variable) { // 声明函数闭包到变量$a, 参数为$arg1, $arg2 ,该闭包需使用$variable变量 }
具体用法实例如下:
<?php $result = 0; $one = function() { var_dump($result); }; $two = function() use ($result) { var_dump($result); }; // 可以认为 $two这个变量 本身记录了该函数的声明以及use使用的变量的值 $three = function() use (&$result) { var_dump($result); }; $result++; $one(); // outputs NULL: $result is not in scope $two(); // outputs int(0): $result was copied $three(); // outputs int(1) ?>
希望本文所述对大家PHP程序设计的学习有一定的借鉴与帮助作用。

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