Retro video games delivered to your door every month!
Click above to get retro games delivered to your door ever month!
escapeshellcmd
OuSob Home Page
PrevNext

escapeshellcmd

(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.

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.

Parameters

command

The command that will be escaped.

Return Values

The escaped string.

Examples

Example 1. escapeshellcmd() example

&#60;?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\"");
?&#62;

See Also

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

PrevHomeNext
escapeshellargUpexec