我正在开发前端表单插件，在使用验证错误消息时遇到问题WP_Error. 我花了几个小时才找到问题，但还是不知道。

下面的代码确实有效，但我真的不认为我应该使用return false; 在内容验证错误消息下方。

/*
**  Process data from front end form
    http://codex.wordpress.org/Function_Reference/wp_insert_post
*/
function write_here_add_new_post() {
    if( \'POST\' == $_SERVER[\'REQUEST_METHOD\'] && !empty( $_POST[\'action\'] ) &&  $_POST[\'action\'] == "write_here_new_post") {

        $title =  wp_strip_all_tags($_POST[\'title\']);
        $content = $_POST[\'content\'];
        $postdate = $_POST[\'date\'];
        $gmtpostdate = $_POST[\'date\'];
        $tags = $_POST[\'post_tags\'];
        $cat  = $_POST[\'cat\'];

        // Server side validation
        if ($title == \'\') {
            write_here_errors()->add(\'title_not_vaild\', __(\'Title not valid\'));
        }
        if ($content == \'\') {
            write_here_errors()->add(\'content_not_vaild\', __(\'Content not valid\'));
            return false;
        }
        if (!$postdate) {
            $postdate = date(\'Y-m-d H:i:s\');
            $gmtpostdate = gmdate(\'Y-m-d H:i:s\');
        }

        // Add the content of the form to $post as an array
        $new_post = array(
            \'post_title\'    => $title,
            \'post_content\'  => $content,
            \'post_category\' => array($cat),     // Default empty.
            \'tags_input\'    => array($tags),    // Default empty.
            \'post_status\'   => \'publish\',       // Choose: publish, preview, future, draft, etc. Default \'draft\'.
            \'post_date\'     => $postdate,       // The time post was made.
            \'post_date_gmt\' => $gmtpostdate     // The time post was made, in GMT.
        );

        //save the new post and return its ID
        $post_id = wp_insert_post($new_post);

        // This will redirect you to the newly created post (Using GUID)
        $post = get_post($post_id);
        wp_redirect($post->guid);
        exit();
    }
}
add_action(\'init\', \'write_here_add_new_post\');

// used for tracking error messages
function write_here_errors(){
    static $wp_error; // Will hold global variable safely
    return isset($wp_error) ? $wp_error : ($wp_error = new WP_Error(null, null, null));
}

// displays error messages from form submissions
function write_here_show_error_messages() {
    if($codes = write_here_errors()->get_error_codes()) {
        echo \'<div class="form-error">\';
        // Loop error codes and display errors
        foreach($codes as $code){
            $message = write_here_errors()->get_error_message($code);
            echo \'<span class="error"><strong>\' . __(\'Error\') . \'</strong>: \' . $message . \'</span><br/>\';
        }
        echo \'</div>\';
    }   
}

谁能告诉我哪里做错了什么？要获取验证错误消息，请使用WP_Error? 非常感谢。

//save the new post and return its ID
$post_id = wp_insert_post($new_post);

// This will redirect you to the newly created post (Using GUID)
$post = get_post($post_id);
wp_redirect($post->guid);
exit();

$errors = write_here_errors()->get_error_messages();

// only create post if there are no errors
if(empty($errors)) {
    //save the new post and return its ID
    $post_id = wp_insert_post($new_post);

    if($post_id) {
        // This will redirect you to the newly created post (Using GUID)
        $post = get_post($post_id);
        wp_redirect($post->guid);
        exit();
    }
}