检查重复的电子邮件地址但排除当前用户

Question

我创建了一个用户登录系统，并有一个页面，用户可以在其中更新其详细信息。电子邮件地址和用户名需要是唯一的，因此我在更新表单中添加了验证。但是，提交表单时会出现错误，提示电子邮件地址已被使用。我可以以某种方式从重复检查中排除当前电子邮件（存储在会话中）吗？

这是我的代码，但不是全部，因为它有点长，我还需要对用户名进行相同的验证检查：

    try {
        $stmt = $db->prepare('SELECT email, username, firstname, middlename, lastname FROM members WHERE memberID = :memberID');
        $stmt->execute(array(':memberID' => $_SESSION['memberID']));
        $row = $stmt->fetch();
    } catch(PDOException $e) {
        echo '<p class="bg-danger">'.$e->getMessage().'</p>';
        }

    //process form
    if(isset($_POST['submit'])){

        // email validation
        if(!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)){
            $error[] = 'Please enter a valid email address';
        } else {
            $stmt = $db->prepare('SELECT email FROM members WHERE email = :email');
            $stmt->execute(array(':email' => $_POST['email']));
            $emailcheck = $stmt->fetch(PDO::FETCH_ASSOC);

            if(!empty($emailcheck['email'])){
                $error[] = 'Email provided is already in use.';
            }
        }

        // insert to DB
        if(!isset($error)){ 

            try {
            $stmt = $db->prepare('UPDATE members SET username=:username, firstname=:firstname, middlename=:middlename, lastname=:lastname, email=:email, updated=NOW() WHERE memberID = :memberID');
                $stmt->execute(array(
                    ':username' => $_POST['username'],
                    ':firstname' => $_POST['firstname'],
                    ':middlename' => $_POST['middlename'],
                    ':lastname' => $_POST['lastname'],
                    ':email' => $_POST['email'],
                    ':memberID' => $_SESSION['memberID']
                ));

            //redirect to page with updated message
            header('Location: personal-details.php?action=updated');
            exit;

            } catch(PDOException $e) {
                $error[] = $e->getMessage();
            }

        } else {
            $error[] = 'Update error';
        }

    }

然后在每个文本框中我使用：

    <input type="text" name="username" id="username" class="form-control" value="<?php echo($row['username']) ?>" tabindex="1">

Answer 1

memberID您也可以像在其他查询中一样使用，但排除它：

SELECT email FROM members WHERE email = :email AND memberID != :memberID