php如何输出一个匿名函数的代码
在php 5.3以后加入了匿名函数,比如像这样一个函数定义
$test = function () { echo 'hello world'; }
像在js中可以直接输出这个函数体的定义代码,我能否在其它地方用类似echo $test
的方法,输出它的函数体呢?
回复内容:
在php 5.3以后加入了匿名函数,比如像这样一个函数定义
$test = function () { echo 'hello world'; }
像在js中可以直接输出这个函数体的定义代码,我能否在其它地方用类似echo $test
的方法,输出它的函数体呢?
用反射可以实现,当然@Rodin也说了,我简单的把代码实现了下
<?php $test = function () { echo 'hello world'; }; function closure_dump($closure) { try { $func = new ReflectionFunction($closure); } catch (ReflectionException $e) { echo $e->getMessage(); return; } $start = $func->getStartLine() - 1; $end = $func->getEndLine() - 1; $filename = $func->getFileName(); echo implode("", array_slice(file($filename),$start, $end - $start + 1)); } closure_dump($test);
匿名函数只在PHP 5.3.0 及以上版本有效。
说实话,之前我还没用过。
var_dump 不可以么?
不能,要调用匿名函数,可以用$_GLOBALS[];
$GLOBALS['test']=function () {
echo'hello,world';
};
$test();
这样就可以调用了
不能。PHP里没有可以反射自身代码的接口。
但可以通过ReflectionFunction类反射出一个方法定义所在文件起至行数,由此结合文件API读出函数的代码。
详情参见:
http://cn2.php.net/manual/en/class.re...

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