Does using magic_quotes() affect the use of mysql_real_escape_string()

Question

If I have magic_quotes switched on and I use mysql_real_escape_string, will the string be double escaped? Will it cause problems?

I assume so based on the get_magic_quotes() function but just seeking confirmation.

(P.S. It's easier to ask this question than test it in my office with all the security we have in place - It takes me 10-15 to configure everything to get a usable environment)

Answer 1

If you escape a value obtained from get/post/cookie input, it will already have addslashes() applied to it, so passing it through mysql_real_escape_string() will in fact, double quote.

To strip em:

if (get_magic_quotes_gpc())
{
    $_GET = json_decode(stripslashes(json_encode($_GET, JSON_HEX_APOS)), true);
    $_POST = json_decode(stripslashes(json_encode($_POST, JSON_HEX_APOS)), true);
    $_COOKIE = json_decode(stripslashes(json_encode($_COOKIE, JSON_HEX_APOS)), true);
    $_REQUEST = json_decode(stripslashes(json_encode($_REQUEST, JSON_HEX_APOS)), true);
    ini_set('magic_quotes_gpc', 0);
}

This question has some other options for stripping quotes / dealing with the horrible magic_quotes_gpc PHP 'feature'.