Props to this really useful post on PHPFreaks.com:
http://www.phpfreaks.com/forums/index.php?topic=219045.0

I was having some issues with a mysqli_real_escape_string function that I had converted from mysql to mysqli I believe that the mere mysql version of this tag can function with just a $value, but the mysqli version requires TWO PARAMETERS: both the $connection variable, and the $string (whatever variable your particular function uses. The one I have here goes through all posts in a foreach statement and escapes the values of all posts using an array (to prevent MySQL injections).

Ex:
//This stops SQL Injection in POST vars
foreach ($_POST as $key => $value) {
$_POST[$key] = mysqli_real_escape_string($connection, $value);
}

$connection = whichever variable you would normally use to reference connection to your MySQL database(s).

THIS POST solved my problem! (Thanks a lot Bendude14!)