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关于preg_replace_callback的用法,该如何解决

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Release: 2016-06-13 12:07:19
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关于preg_replace_callback的用法

不知道为什么这个user获取到,在其他的地方是可以获取到的,但是在这个回调函数中获取不到,忘高手指点,其他的地方都是没问题的,我测试了很多次,username那里,就是那样的写的,因为它是个字符串
------解决思路----------------------
这个地方涉及PHP的闭包  要在匿名函数中加上use($user)     关于闭包详细资料请百度之

function replace_var($user,$str){<br />	<br />	$varPattern = '/\{\$.*?\}/';<br />	<br />	$str = preg_replace_callback($varPattern,function($matches) use($user){<br />		if($matches[0] == '{$usrename}'){<br />			var_dump($user);<br />		}<br />	},$str);<br /><br />}
Copy after login

------解决思路----------------------
这与闭包没有关系!
是变量的作用域问题

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