Руководство по PHP
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# escapeshellcmd

(PHP 3, PHP 4, PHP 5)

escapeshellcmd -- Escape shell metacharacters

## Описание

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.

Following characters are preceded by a backslash: #&;`|*?~<>^()[]{}$\, \x0A and \xFF. ' and " are escaped only if they are not paired. In Windows, all these characters plus % are replaced by a space instead.

## Список параметров

command

  The command that will be escaped.

## Возвращаемые значения

The escaped string.

## Примеры

Пример 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\""); ?>`

## Смотрите также

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

Пред. | Начало | След.
escapeshellarg | Уровень выше | exec