PHP中的system()，exec()和shell_exec()有什么区别? [英] What are the differences of system(), exec() and shell_exec() in PHP?

问题描述

可以通过以下三个PHP函数运行外部命令

It is possible to run an external command by three PHP functions of

system();
exec();
shell_exec();

但是它们有什么区别?尽管它们有特定的应用，但在大多数情况下，它们可以同等使用.我很好奇知道什么时候可以优先使用它们.例如，要解压缩文件或压缩文件夹(使用tar命令)，哪个是首选的(可能是从性能的角度来看)?

but what are their differences? In spite of their specific applications, in most cases, the can be equally used. I am curious to know which is preferred one when they can be equally used. For example, for unzipping a file or compressing a folder (with tar command), which one is preferred (probably from performance point of view)?

更新:在另一个问题中，我发现了一个非常有用的

UPDATE: In another question, I found a very useful link describing different aspects for these functions. I share the link here, as other may use to better understand security issues and other aspects.

推荐答案

exec —执行外部程序

系统-执行外部程序并显示输出

system — Execute an external program and display the output

shell_exec —通过shell执行命令并以字符串形式返回完整输出

shell_exec — Execute command via shell and return the complete output as a string

所以如果您不需要输出，我会选择exec.

so if you don't need the output, I would go with exec.

更多详细信息:

• http://php.net/manual/en/function.exec.php
• http://php.net/manual/en/function.system.php
• http://php.net/shell_exec

• http://php.net/manual/en/function.exec.php
• http://php.net/manual/en/function.system.php
• http://php.net/shell_exec

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