如何执行字符串php代码来运行

Question

I have got string response is "<?php $a=array("10","20"); echo $a[0]+a[1]; ?>"

How to execute this string. I use PHP 7.0.

Please give any solution.

Answer 1

As already stated you can use eval($string);. Beware that eval() evaluates a string as PHP code, so you need to be careful with the strings you allow to be passed!

If you take the string yourself from a predefined set of strings you created (using a swtich statement or something similar) it shouldn't be a problem.

If the string comes from the outside (user input or cURL requests or whatever) you shouldn't trust it and you should avoid using this method.