############################### # 檢查users=> email 是否重覆 # Email存在 傳回 false ############################### function checkEmail($email){ global $db; $valid = true; $sql= "select uid from `users` where `email`='{$email}' "; $result = $db->query($sql); if($result){ list($uid) = $result->fetch_row(); if($uid){ $valid = false; } } return $valid; } ```