WordPress:Function Reference/email exists

描述

This function will check whether or not a given email address ($email) has already been registered to a username, and returns that users ID (or false if none exists). See also username_exists.

这个函数检查是否已经为用户注册了电子邮件地址($email)，而且返回用户ID(或者如果不存在电子邮件地址，返回错误的)。也看看username_exists。

例子

默认用法

This function is normally used when a user is registering, to ensure that the E-mail address the user is attempting to register with has not already been registered.

<?php if ( email_exists($email) ) { . . . } ?>

用户注册时，通常使用这个函数，确认用户试图注册的电子邮件地址，还没有注册。

详细的例子

If the E-mail exists, echo the ID number to which the E-mail is registered. Otherwise, tell the viewer that it does not exist.

如果电子邮件存在，echo电子邮件注册的ID数字。否则的话，通知访客不存在这个电子邮件。

<?php
  $email = 'myemail@example.com';
  if ( email_exists($email) )
    echo "That E-mail is registered to user number " . email_exists($email);
  else
    echo "That E-mail doesn't belong to any registered users on this site";
?>

<?php
  $email = 'myemail@example.com';
  if ( email_exists($email) )
    echo "That E-mail is registered to user number " . email_exists($email);
  else
    echo "这封电子邮件不属于这个站点上任何注册的用户";
?>

返回

• If the E-mail exists, function returns the ID of the user to whom the E-mail is registered.

• 如果电子邮件存在，函数返回已经注册电子邮件的用户的ID。

• If the E-mail does not exist, function returns false.
• 如果电子邮件不存在，函数返回错误的。