Graham recently asked me: Do I still need to used mysqli_real_escape_string when used prepared statements in PHP? The simple answer is no. The way it used to work is that you would take form input data, put that into a variable, and inject that data into your MySQL query in order to add that data to the database. Now, a big problem with that is SQL Injection attacks where a hacker could inject SQL code into your query and perform actions on your database… which is something you definitely don’t want. So, the standard solution became using mysql_real_escape_string to sanitize
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