编辑“WordPress:Function Reference/email exists”

==Description==
== 描述 ==
This function will check whether or not a given email address (<tt>$email</tt>) has already been registered to a username, and returns that users ID (or <tt>false</tt> if none exists). See also [[WordPress:Function Reference/username exists|username_exists]].

这个函数检查是否已经为用户注册了电子邮件地址(<tt>$email</tt>)，而且返回用户ID(或者如果不存在电子邮件地址，返回<tt>错误的</tt>)。也看看[[WordPress:Function Reference/username exists|username_exists]]。

== Examples ==

=== Default Usage ===

== 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。

=== Detailed Example ===

=== 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。

<pre><?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";
?></pre>

<pre><?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";
?></pre>

== Parameter ==

== 参数==

{{Parameter|$email|string|The E-mail address to check|required}}

{{Parameter|$email|string|需要确认的电子邮件地址|required}}

== Return ==

== 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 <tt>false</tt>.
*如果电子邮件不存在，函数返回<tt>错误的</tt>。