escapeshellarg
(PHP 4 >= 4.0.3, PHP 5, PHP 7, PHP 8)
escapeshellarg — Escape a string to be used as a shell argument
Description
$arg): stringescapeshellarg() adds single quotes around a string and quotes/escapes any existing single quotes allowing you to pass a string directly to a shell function and having it be treated as a single safe argument. This function should be used to escape individual arguments to shell functions coming from user input. The shell functions include exec(), system() and the backtick operator.
On Windows, escapeshellarg() instead replaces percent
signs, exclamation marks (delayed variable substitution) and double quotes
with spaces and adds double quotes around the string.
Furthermore, each streak of consecutive backslashes (\)
is escaped by one additional backslash.
Parameters
-
arg -
The argument that will be escaped.
Return Values
The escaped string.
Examples
Example #1 escapeshellarg() example
<?php
system('ls '.escapeshellarg($dir));
?>
See Also
- escapeshellcmd() - Escape shell metacharacters
- exec() - Execute an external program
- popen() - Opens process file pointer
- system() - Execute an external program and display the output
- backtick operator
