如何覆盖WordPress核心功能

时间:2012-10-04 00:28:07

标签: wordpress wordpress-theming

我正在尝试编辑您在未键入注释的情况下点击添加评论按钮(来自管理面板)时显示的错误消息。

这是处理此错误消息的wp_ajax_replyto_comment函数(来自 wp-admin / includes / ajax-actions.php )。

function wp_ajax_replyto_comment( $action ) {
    global $wp_list_table, $wpdb;
    if ( empty( $action ) )
        $action = 'replyto-comment';

    check_ajax_referer( $action, '_ajax_nonce-replyto-comment' );

    set_current_screen( 'edit-comments' );

    $comment_post_ID = (int) $_POST['comment_post_ID'];
    if ( !current_user_can( 'edit_post', $comment_post_ID ) )
        wp_die( -1 );

    $status = $wpdb->get_var( $wpdb->prepare("SELECT post_status FROM $wpdb->posts WHERE ID = %d", $comment_post_ID) );

    if ( empty($status) )
        wp_die( 1 );
    elseif ( in_array($status, array('draft', 'pending', 'trash') ) )
        wp_die( __('ERROR: you are replying to a comment on a draft post.') );

    $user = wp_get_current_user();
    if ( $user->exists() ) {
        $user_ID = $user->ID;
        $comment_author       = $wpdb->escape($user->display_name);
        $comment_author_email = $wpdb->escape($user->user_email);
        $comment_author_url   = $wpdb->escape($user->user_url);
        $comment_content      = trim($_POST['content']);
        if ( current_user_can( 'unfiltered_html' ) ) {
            if ( wp_create_nonce( 'unfiltered-html-comment' ) != $_POST['_wp_unfiltered_html_comment'] ) {
                kses_remove_filters(); // start with a clean slate
                kses_init_filters(); // set up the filters
            }
        }
    } else {
        wp_die( __( 'Sorry, you must be logged in to reply to a comment.' ) );
    }

    if ( '' == $comment_content )
        wp_die( __( 'ERROR: please type a comment.' ) );

    $comment_parent = absint($_POST['comment_ID']);
    $comment_auto_approved = false;
    $commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type', 'comment_parent', 'user_ID');

    $comment_id = wp_new_comment( $commentdata );
    $comment = get_comment($comment_id);
    if ( ! $comment ) wp_die( 1 );

    $position = ( isset($_POST['position']) && (int) $_POST['position'] ) ? (int) $_POST['position'] : '-1';

    // automatically approve parent comment
    if ( !empty($_POST['approve_parent']) ) {
        $parent = get_comment( $comment_parent );

        if ( $parent && $parent->comment_approved === '0' && $parent->comment_post_ID == $comment_post_ID ) {
            if ( wp_set_comment_status( $parent->comment_ID, 'approve' ) )
                $comment_auto_approved = true;
        }
    }

    ob_start();
        if ( 'dashboard' == $_REQUEST['mode'] ) {
            require_once( ABSPATH . 'wp-admin/includes/dashboard.php' );
            _wp_dashboard_recent_comments_row( $comment );
        } else {
            if ( 'single' == $_REQUEST['mode'] ) {
                $wp_list_table = _get_list_table('WP_Post_Comments_List_Table');
            } else {
                $wp_list_table = _get_list_table('WP_Comments_List_Table');
            }
            $wp_list_table->single_row( $comment );
        }
        $comment_list_item = ob_get_contents();
    ob_end_clean();

    $response =  array(
        'what' => 'comment',
        'id' => $comment->comment_ID,
        'data' => $comment_list_item,
        'position' => $position
    );

    if ( $comment_auto_approved )
        $response['supplemental'] = array( 'parent_approved' => $parent->comment_ID );

    $x = new WP_Ajax_Response();
    $x->add( $response );
    $x->send();
}

我想仅覆盖此部分:

if ( '' == $comment_content )
        wp_die( __( 'ERROR: please type a comment.' ) );

这是我的代码,放在我的主题functions.php

function my_function_name() {
    if ( '' == $comment_content )
        wp_die( __( 'My custom message here' ) );
}
add_filter( 'wp_ajax_replyto_comment', 'my_function_name' );

不幸的是,我的代码不起作用。请帮我!谢谢!

1 个答案:

答案 0 :(得分:7)

某些功能是“可插拔的”,您可以在其中覆盖它们,但这不是其中之一。

调整核心功能的唯一方法是使用动作挂钩和过滤器,除非您想直接进入并编辑核心(不好的做法......升级核心将覆盖您的更改)。

如果您在核心中找到do_action('something');,则可以使用add_action('something','my_function');

如果您在核心中找到apply_filters('something', $value),则可以使用add_filter('something', 'my_function');过滤该$值。

顺便说一下,在上面的例子中,你会这样做:

function my_function($value){
    // manipulate $value
    return $value;
}

确保将某些内容作为过滤后的值返回。不幸的是,我似乎无法找到任何地方为此:(。

有关详细信息,请参阅http://codex.wordpress.org/Plugin_API

如果您必须更改该文本,则可以在使用javascript加载页面后执行此操作。