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escapeshellcmd
Escape shell metacharacters
(PHP 4, PHP 5)
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.
Examples
Example 2011. 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\"");
?>