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Hello all, This is my first post. Im trying to learn PHP from scratch. So for myself im making a registration system and some other things but there is something strange happening and i can not figure it out. I have a registration form that makes a email activation link. So now on activation.php im doing something like this <?phpif (isset($_GET['emailcode'])) { $emailcode = strip_tags(trim($_GET['emailcode'])); //Check if only numbers and letters if (!preg_match("/^[a-zA-Z0-9]+$/", $emailcode)){ echo $emailcode; $errors[] = 'code is not ok..'; } else { activateUser($emailcode); } } activateUser goes tot functions.php where i do this function activateUser($emailcode) { $sql = "SELECT * FROM users WHERE emailcode='$emailcode' LIMIT 1"; $query = mysqli_query($db_connect, $sql); $code_check = mysqli_num_rows($query); if ($code_check == 1) { echo 'exists'; } } the strange thing is, it returns nothing.. but when i attach te code on the activation page itself like this: <?phpif (isset($_GET['emailcode'])) { $emailcode = strip_tags(trim($_GET['emailcode'])); //Check if only numbers and letters if (!preg_match("/^[a-zA-Z0-9]+$/", $emailcode)){ echo $emailcode; $errors[] = 'De door jou opgegeven email code klopt niet'; } else { $sql = "SELECT * FROM users WHERE emailcode='$emailcode' LIMIT 1"; $query = mysqli_query($db_connect, $sql); //Tellen hoeveel rijen er gevonden zijn 0 of 1 $code_check = mysqli_num_rows($query); if ($code_check == 1) { echo 'exists'; } } } ?> it does work.... what am i doing wrong? on the activation page I have included de db connect and the functions...