有几种可能性。

Use the settings API to add a form field somewhere in your admin area 用户可以在其中输入他们想要使用的电子邮件。使用在挂钩函数中检索它get_option.

如果你想在任何地方都使用同样的电子邮件，这将是一种方法。

<?php
add_filter(\'wp_mail_from\', \'wpse66067_mail_from\');
function wpse66067_mail_from($email)
{
    if($e = get_option(\'wpse66067_option\'))
        return $e;

    return $email; // we don\'t have anything in the option return default.
}

Use an object, and store the from email as a property. 如果您需要在每次发送的基础上更改发件人电子邮件，这将是一种方法。

<?php
class WPSE66067_Emailer
{
    private static $from_email = \'[email protected]\';

    public static  function send_mail()
    {
        add_filter(\'wp_mail_from\', array(__CLASS__, \'from_email\');

        // change the email
        self::$from_email = \'[email protected]\';

        wp_mail( /* args here */ );

        // you probably don\'t need to do this.
        remove_filter(\'wp_mail_from\', array(__CLASS__, \'from_email\');
    }

    public static function from_email($e)
    {
        if(self::$from_email)
            return self::$from_email;

        return $e;
    }
}

Use a global. 这（可能）是个糟糕的主意。如果每次都需要更改电子邮件，请使用对象和属性（请参见上文）。

<?php
$wpse66067_email = \'[email protected]\';

function wpse66067_send_mail()
{
    // globalize and change the email
    global $wpse66067_email;
    $wpse66067_email = \'[email protected]\';

    add_filter(\'wp_mail_from\', \'wpse66067_from_email\');

    wp_mail( /* args here */ );
}

function wpse66067_from_email($e)
{
    global $wpse66067_email;
    if($wpse66067_email)
        return $wpse66067_email;

    return $e;
}