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# escapeshellcmd

(PHP 3, PHP 4, PHP 5)

escapeshellcmd -- Escape shell metacharacters

## 说明

string escapeshellcmd ( string command )

escapeshellcmd() escapes any characters in a string that might be used to trick a shell command into executing arbitrary commands. This function should be used to make sure that any data coming from user input is escaped before this data is passed to the exec() or system() functions, or to the backtick operator.

## 参数

command

  The command that will be escaped.

## 返回值

The escaped string.

## 例

例子 1. escapeshellcmd() example
`<?php $e = escapeshellcmd($userinput); // here we don't care if $e has spaces system("echo $e"); $f = escapeshellcmd($filename); // and here we do, so we use quotes system("touch \"/tmp/$f\"; ls -l \"/tmp/$f\""); ?>`

## 参见

escapeshellarg()
exec()
popen()
system()
backtick operator

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