Admins eHow SysAdmin Tips & Tricks

March 18, 2010

Prevent MySQL Injection in PHP

Filed under: General,MySQL,PHP,Security — Tags: , , , , — admin @ 5:21 pm

As it is explained everywhere on the web , the general solution to prevent mysql injection attacks in php is to use mysql_real_escape_string function , there are many guides on how to use it in conjunction with sprintf to escape dangerous characters before executing a mysql query, but I found a very innovative solution in a comment on website , it recommends to escape all variables sent by user by get or post method in the beginning of every page which executes mysql queries :
first make sure magic_quotes_gpc is turned off on your php configuration , it can be checked on php info page.
this step makes sure your variables are not escaped twice.
This article explains how to disable magic quotes : Disabling Magic Quotes Guide
put the following code in the beginning of every page executing mysql queries :

	include ('mysql_connect.php');
	//This stops SQL Injection in POST vars
	foreach ($_POST as $key => $value) {
		$_POST[$key] = mysql_real_escape_string($value);

	//This stops SQL Injection in GET vars
	foreach ($_GET as $key => $value) {
		$_GET[$key] = mysql_real_escape_string($value);

mysql_real_escape_string needs you to be connected to your mysql database when you call it , so I have placed include (‘mysql_connect.php’); in the beginning of script , you can replace it with your own mysql connect commands.

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