我将此代码用作自定义注册表单。是否有机会为其创建成功消息？

<?php
/*
** Template Name: Custom Register Page
*/
get_header();

global $wpdb, $user_ID;  

    if (isset($_POST[\'user_registeration\']))
    {
        //registration_validation($_POST[\'username\'], $_POST[\'useremail\']);
        global $reg_errors;
        $reg_errors = new WP_Error;
        $username=$_POST[\'username\'];
        $useremail=$_POST[\'useremail\'];
        $password=$_POST[\'password\'];
        
        
        if(empty( $username ) || empty( $useremail ) || empty($password))
        {
            $reg_errors->add(\'field\', \'Required form field is missing\');
        }    
        if ( 6 > strlen( $username ) )
        {
            $reg_errors->add(\'username_length\', \'Username too short. At least 6 characters is required\' );
        }
        if ( username_exists( $username ) )
        {
            $reg_errors->add(\'user_name\', \'The username you entered already exists!\');
        }
        if ( ! validate_username( $username ) )
        {
            $reg_errors->add( \'username_invalid\', \'The username you entered is not valid!\' );
        }
        if ( !is_email( $useremail ) )
        {
            $reg_errors->add( \'email_invalid\', \'Email id is not valid!\' );
        }
        
        if ( email_exists( $useremail ) )
        {
            $reg_errors->add( \'email\', \'Email Already exist!\' );
        }
        if ( 5 > strlen( $password ) ) {
            $reg_errors->add( \'password\', \'Password length must be greater than 5!\' );
        }
        
        if (is_wp_error( $reg_errors ))
        { 
            foreach ( $reg_errors->get_error_messages() as $error )
            {
                 $signUpError=\'<p style="color:#FF0000; text-aling:left;"><strong>ERROR</strong>: \'.$error . \'<br /></p>\';
            } 
        }
        
        
        if ( 1 > count( $reg_errors->get_error_messages() ) )
        {
            // sanitize user form input
            global $username, $useremail;
            $username   =   sanitize_user( $_POST[\'username\'] );
            $useremail  =   sanitize_email( $_POST[\'useremail\'] );
            $password   =   esc_attr( $_POST[\'password\'] );
            
            $userdata = array(
                \'user_login\'    =>   $username,
                \'user_email\'    =>   $useremail,
                \'user_pass\'     =>   $password,
                );
            $user = wp_insert_user( $userdata );
        }
        
    
    } 
    

?>


<h3>Create your account</h3>
<form action="" method="post" name="user_registeration">
    <label>Username <span class="error">*</span></label>
    <input type="text" name="username" placeholder="Enter Your Username" class="text" required /><br />
    <label>Email address <span class="error">*</span></label>
    <input type="text" name="useremail" class="text" placeholder="Enter Your Email" required /> <br />
    <label>Password <span class="error">*</span></label>
    <input type="password" name="password" class="text" placeholder="Enter Your password" required /> <br />
    <input type="submit" name="user_registeration" value="SignUp" />
</form>
<?php if(isset($signUpError)){echo \'<div>\'.$signUpError.\'</div>\';}?>