PHP eval $ a ="$ a"? [英] PHP eval $a="$a"?

问题描述

我正在查看一些工作代码，并发现以下内容:

I was looking through some code for work, and came across this line:

eval("\$element = \"$element\";");

对于为什么任何PHP开发人员都会编写此行，我确实感到困惑.除了为其本身设置变量外，这还可以达到什么目的?

I'm really confused as to why any PHP developer would've written this line. What purpose does this serve, besides setting a variable to itself?

幸运的是，此行所在的函数从未调用过.

Luckily, the function this line is in is never called.

推荐答案

<?php
$string = 'cup';
$name = 'coffee';
$str = 'This is a $string with my $name in it.';
echo $str. "\n";
eval("\$str = \"$str\";");
echo $str. "\n";
?> 

上面的示例将输出:

This is a $string with my $name in it.
This is a cup with my coffee in it.

http://php.net/manual/en/function.eval.php

我只做ctl + c ctrl + v:-)

I do just ctl+c ctrl+v :-)

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