php的四个函数exec,shell_exec,system,passthru可以执行系统指令，对系统安全构成威胁，如果不用的话可以将其关闭
| 代码如下 |
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vim /etc/php.ini
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去掉disable_functions前注释，编辑内容如下
| 代码如下 |
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disable_functions = exec,shell_exec,system,passthru,popen
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友情提示，有朋友说想过滤eval函数，在php中这个不是函数无法在disable_functions禁止的哦
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