WordPress函数email_exists()确定给定的电子邮件是否存在
在 WordPress CMS内容管理系统中,email_exists()
是一个内置函数,用于检查 WordPress 数据库中是否存在给定的电子邮件地址。它需要一个参数:$email
:这是用于检查是否存在的电子邮件地址
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email_exists()函数基本语法
描述
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用法
email_exists( $email );
示例:
$email = 'myemail@example.com';
$exists = email_exists($email);
if ($exists) {
echo "That E-mail is registered to user number " . $exists;
} else {
echo "That E-mail doesn't belong to any registered users on this site";
}
参数
- $email (string):这是您要检查是否存在的电子邮件地址。
email_exists()函数
email_exists()
功能通常用在注册表中,以确保用户不会使用已在使用的电子邮件地址创建帐户。它还可用于在发送电子邮件或执行其他操作之前检查现有用户(源文件可参考这里)
function email_exists( $email ) {
$user = get_user_by( 'email', $email );
if ( $user ) {
$user_id = $user->ID;
} else {
$user_id = false;
}
/**
* Filters whether the given email exists.
*
* @since 5.6.0
*
* @param int|false $user_id The user ID associated with the email,
* or false if the email does not exist.
* @param string $email The email to check for existence.
*/
return apply_filters( 'email_exists', $user_id, $email );
}
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如何使用email_exists()
检查特定电子邮件,我们想要检查“xiao@pythonthree.com”是否已在该网站上注册。
$email = 'xiao@pythonthree.com';
$exists = email_exists($email);
if ($exists) {
echo "The email " . $email . " is registered with user ID " . $exists;
} else {
echo "The email " . $email . " is not registered on this site";
}
检查动态输入的电子邮件,此示例演示如何检查用户在表单中输入的电子邮件。
$email = $_POST['email'];
$exists = email_exists($email);
if ($exists) {
echo "Thank you for logging in, your user ID is " . $exists;
} else {
echo "This email is not registered. Please sign up.";
}
检查数组中的多封电子邮件,假设我们有一组电子邮件,我们想找出哪些电子邮件已注册。
$emails = ['jack@beanstalk.com', 'giant@cloud.com', 'hen@goldeneggs.com'];
foreach ($emails as $email) {
$exists = email_exists($email);
if ($exists) {
echo "The email " . $email . " is registered with user ID " . $exists;
} else {
echo "The email " . $email . " is not registered on this site";
}
}
在登录过程中使用该函数,此功能可用作登录过程的一部分,以在尝试密码匹配之前检查电子邮件是否存在。
$email = $_POST['email'];
$exists = email_exists($email);
if ($exists) {
// Proceed with password verification
} else {
echo "This email is not registered. Please sign up.";
}
注册前检查电子邮件,在注册新用户之前,我们可以检查一下该邮箱是否已经被注册。
$email = $_POST['email'];
$exists = email_exists($email);
if ($exists) {
echo "This email is already registered. Please log in.";
} else {
// Proceed with registration process
}
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