addslashes
PHP function
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(PHP 4, PHP 5, PHP 7, PHP 8)
Quote string with slashes
Description
addslashes(string $string): string
Returns a string with backslashes added before characters that need to be escaped. These characters are:
- single quote (
') - double quote (
") - backslash (
\) - NUL (the NUL byte)
A use case of addslashes() is escaping the aforementioned characters in a string that is to be evaluated by PHP:
Escaping Characters
php
<?php
$str = "O'Reilly?";
eval("echo '" . addslashes($str) . "';");
?>The addslashes() is sometimes incorrectly used to try to prevent SQL Injection. Instead, database-specific escaping functions and/or prepared statements should be used.
Parameters
stringThe string to be escaped.
Return Values
Returns the escaped string.
Examples
An addslashes() example
php
<?php
$str = "Is your name O'Reilly?";
// Outputs: Is your name O\'Reilly?
echo addslashes($str);
?>