原型
admin_created_user_subject( $text )
源文件
路径:wp-admin/user-new.php
<?php
...
$user_details = null;
$user_email = wp_unslash( $_REQUEST['email'] );
if ( false !== strpos( $user_email, '@' ) ) {
...
?>
其他
英文文档:https://developer.wordpress.org/reference/functions/admin_created_user_subject/