Level 16 → Level 17

'); mysql_select_db('natas17', $link); $query = "SELECT * from users where username=\"".$_REQUEST["username"]."\""; if(array_key_exists("debug", $_GET)) { echo "Executing query: $query"; } $res = mysql_query($query, $link); if($res) { if(mysql_num_rows($res) > 0) { //echo "This user exists."; } else { //echo "This user doesn't exist."; } } e..