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如何让文件流的变量运行？

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Release： 2016-06-23 14:15:34
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1.文本文件a.txt，里面写的是$a
2.我有一个my.php,里面是这样的写的 

<?php$a="ok";file_get_content("a.txt","r+");//这是操作代码，我不会//文件读进来了，我马上要再保存成文本，但是我想把文本里面的$a换成php里面$a的值okfile_put_content("b.txt","w+");
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文本读入php，里面的东西好像不会和php起反应，打开是$a,在php里面跑了一圈保存了还是$a,有没有办法让文件流里面的变量在php里面运行呢？

即含有$a的a.txt -----> 读入php-------->含有ok的a.txt


回复讨论(解决方案)

文本替换
ob + eval
ob + include
ob + phar

看一下字符串函数吧。

大概猜测你需要用eval这个函数

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如何让文件流的变量运行？
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