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(PHP 3, PHP 4, PHP 5)

escapeshellcmd -- Escape shell metacharacters

Description

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 .

Parameters

command

The command that will be escaped.

Return Values

The escaped string.

Examples

Example 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\"");
?>

Related Function(s)

exec()

system()

escapeshellarg()

popen()