如何检查php上是否存在mcrypt扩展名 [英] How to check if mcrypt extension exists on php

问题描述

我想知道最简单和最快的PHP代码行，以检查是否可以/安装了mcrypt扩展。

I would like to know the simplest and fastest PHP code line to check if mcrypt extension is available/installed.

有一个函数加密一个字符串，第一个它需要检查mcrypt是否可用。如果没有，它将执行系统上可用的备用加密解决方案。

There is a function that encrypts a string and first it requires to check if mcrypt is usable. If not, it will execute an alternative encrypt solution available on the system.

谢谢！

推荐答案

您可以使用 function_exists 来检查其中一个mcrypt函数是否存在。

You can use function_exists to check if one of the mcrypt functions exists.

if(function_exists('mcrypt_encrypt')) {
    echo "mcrypt is loaded!";
} else {
    echo "mcrypt isn't loaded!";
}

编辑30.07.2016：

由于我的答案还是得到了不时的升华，我评估了我的表现和克里斯蒂·德拉吉奇的答案。结论是， function_exists 比 extension_loaded 快一点。 https://3v4l.org/So4Ep

Edit 30.07.2016:
Since my answer still gets a few upvotes from time to time, I benchmarked the performance of mine and Cristi Draghici's answers. The conclusion is, that function_exists is a bit faster than extension_loaded. https://3v4l.org/So4Ep

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