Description:
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From manual page: http://www.php.net/function.addslashes#Description
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Fix the following paragraph because magic_quotes_gpc is off now by default:

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.