Anti MySQL Injection Function in PHP

How to Avoid MySQL Injection

This PHP function will clean mysql injection codes in the input field. This will help our website free from SQL Injection.
//source code anti mysql injection function function anti_sqlinjection($dirty){
if (get_magic_quotes_gpc())
$clean = mysql_real_escape_string(stripslashes($dirty));
else
$clean = mysql_real_escape_string($dirty);
return $clean;
}