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PHP Manual [escapeshellcmd]

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PHP Manual || Program execution Functions

(PHP 4, PHP 5, PHP 7)

escapeshellcmdEscape shell metacharacters

Description

escapeshellcmd ( string $command ) : string

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. On Windows, all these characters plus % and ! are preceded by a caret (^).

Parameters

command

The command that will be escaped.

Return Values

The escaped string.

Examples

Example #1 escapeshellcmd() example

<?php
// We allow arbitrary number of arguments intentionally here.
$command './configure '.$_POST['configure_options'];

$escaped_command escapeshellcmd($command);
 
system($escaped_command);
?>

Warning

escapeshellcmd() should be used on the whole command string, and it still allows the attacker to pass arbitrary number of arguments. For escaping a single argument escapeshellarg() should be used instead.

Changelog

Version Description
5.4.43, 5.5.27, 5.6.11 Exclamation marks are replaced by spaces.
5.3.0 On Windows, the special characters are now properly escaped. Previously, they have been replaced with a space character.

See Also



PHP Manual || Program execution Functions