(PHP 4, PHP 5)
addslashes — Quote string with slashes
$str
)
Returns a string with backslashes before characters that need
to be quoted in database queries etc. These characters are
single quote ('), double quote
("), backslash (\)
and NUL (the NULL byte).
An example use of addslashes() is when you're entering data into a database. For example, to insert the name O'reilly into a database, you will need to escape it. It's highly recommended to use DBMS specific escape function (e.g. mysqli_real_escape_string() for MySQL or pg_escape_string() for PostgreSQL), but if the DBMS you're using doesn't have an escape function and the DBMS uses \ to escape special chars, you can use this function. This would only be to get the data into the database, the extra \ will not be inserted. Having the PHP directive magic_quotes_sybase set to on will mean ' is instead escaped with another '.
The PHP directive magic_quotes_gpc was on by default before PHP 5.4, and it essentially ran addslashes() on all GET, POST, and COOKIE data. Do not use addslashes() on strings that have already been escaped with magic_quotes_gpc as you'll then do double escaping. The function get_magic_quotes_gpc() may come in handy for checking this.
str
The string to be escaped.
Returns the escaped string.
Example #1 An addslashes() example
<?php
$str = "Is your name O'reilly?";
// Outputs: Is your name O\'reilly?
echo addslashes($str);
?>