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# addslashes

(PHP 3, PHP 4 , PHP 5)

addslashes -- Quote string with slashes

## Description

string addslashes ( string 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. Most databases do this with a \ which would mean O\'reilly. 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 is on by default, and it essentially runs 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.

範例 1. An addslashes() example

`<?php $str = "Is your name O'reilly?"; // Outputs: Is your name O\'reilly? echo addslashes($str); ?>`

See also stripslashes(), htmlspecialchars(), quotemeta(), and get_magic_quotes_gpc().

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