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escapeshellcmd

(PHP 4, PHP 5, PHP 7)

escapeshellcmdEscape shell metacharacters

Descrierea

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 % and ! are replaced by a space instead.

Parametri

command

The command that will be escaped.

Valorile întoarse

The escaped string.

Exemple

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);
?>

Avertizare

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.

Istoricul schimbărilor

Versiune Descriere
5.6.0 Valoarea implicită a parametrului encoding a fost schimbată pentru a coincide cu valoarea opțiunii de configurare default_charset.
5.4.43, 5.5.27, 5.6.11 Exclamation marks are replaced by spaces.

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PHP Manual