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web-为什么将网页变成字符串再echo出来，其php代码就失效了

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Release： 2016-06-02 11:28:54
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phpweb

普通的后缀为.php的文档其中能运行php语句
而我用file__get__contents（）函数将其转化为字符串，再用echo输出来
里面的php语句就无法被解析了
如：
$web__file = file__get__contents("demo__web.php");
echo $web__file_

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