Question

我对使用csv import导入wordpress中的帖子有疑问。我已经将csv映射为“post_title”“post_content”“featured_image”等。所有帖子都已导入，但特色图片未显示。

特色图片网址仅显示在自定义字段中。我的问题是，如何显示特色图片？因为我有数百个帖子，我无法手动编辑它们。

Answer 1

我遇到了同样的问题–我在多个帖子中都有自定义字段，其中包含要用于特色图片的URL。我知道某些图片已经在我的媒体库中，因此我做了以下功能，将一个批量编辑操作添加到编辑器窗口中，该窗口遍历了帖子并上传了图像，而这些图像已经不在库中了，或已在库中获取图像的ID，然后将其设置为帖子的新精选图像。

这是一个粗略的代码，但是可以正常工作-不过请先备份您的网站。

function does_file_exists($filename) {
    global $wpdb;
    $data = $wpdb->get_results( "SELECT post_id FROM {$wpdb->postmeta} WHERE meta_value LIKE '%/$filename'" );
    foreach ($data as $ID){
        $ID = $ID->post_id;
        if (get_post_type($ID) == "attachment"){
            return $ID;
        }
    }
    return null;
}

function upload_image_from_URL($image_url, $post_id){
    // Add Featured Image to Post
    $image_name       = pathinfo($image_url)['basename'];
    $upload_dir       = wp_upload_dir(); // Set upload folder
    $image_data       = file_get_contents($image_url); // Get image data
    $unique_file_name = wp_unique_filename( $upload_dir['path'], $image_name ); // Generate unique name
    $filename         = basename( $unique_file_name ); // Create image file name

    // Check folder permission and define file location
    if( wp_mkdir_p( $upload_dir['path'] ) ) {
        $file = $upload_dir['path'] . '/' . $filename;
    } else {
        $file = $upload_dir['basedir'] . '/' . $filename;
    }

    // Create the image  file on the server
    file_put_contents( $file, $image_data );

    // Check image file type
    $wp_filetype = wp_check_filetype( $filename, null );

    // Set attachment data
    $attachment = array(
        'post_mime_type' => $wp_filetype['type'],
        'post_title'     => sanitize_file_name( $filename ),
        'post_content'   => '',
        'post_status'    => 'inherit'
    );

    // Create the attachment
    $attach_id = wp_insert_attachment( $attachment, $file, $post_id );

    // Include image.php
    require_once(ABSPATH . 'wp-admin/includes/image.php');

    // Define attachment metadata
    $attach_data = wp_generate_attachment_metadata( $attach_id, $file );

    // Assign metadata to attachment
    wp_update_attachment_metadata( $attach_id, $attach_data );
    return $attach_id;
}

function set_featured_image($post_id){
    if (wp_is_post_revision($post_id)) return;
    if (has_post_thumbnail($post_id)) return;

    $image_url = get_field('FIELD_NAME', $post_id);

    if ($image_url){        
        $attachment_ID = does_file_exists(pathinfo($image_url)['basename']);
        $attachment_ID = ($attachment_ID ? $attachment_ID : upload_image_from_URL($image_url, $post_id));

        if ($attachment_ID){
            $message = "Setting attachment ". $attachment_ID ." to post ". $post_id;
            error_log($message);
            set_post_thumbnail($post_id, $attachment_ID);
        }
    }
}

add_filter( 'bulk_actions-edit-post', 'register_bulk_update_featured_image' );
function register_bulk_update_featured_image($bulk_actions) {
    $bulk_actions['update_featured_image'] = "Get featured image from field";
    return $bulk_actions;
}

add_filter( 'handle_bulk_actions-edit-post', 'bulk_update_featured_image', 10, 3 );
function bulk_update_featured_image( $redirect_to, $doaction, $post_ids ) {
    if ( $doaction !== 'update_featured_image' ) {
        return $redirect_to;
    }
    foreach ( $post_ids as $post_id ) {
        // Perform action for each post.
        set_featured_image($post_id);
    }
    $redirect_to = add_query_arg( 'bulk_updated_featured_images', count( $post_ids ), $redirect_to );
    return $redirect_to;
}

add_action( 'admin_notices', 'my_bulk_action_admin_notice' );
function my_bulk_action_admin_notice() {
    if ( ! empty( $_REQUEST['bulk_updated_featured_images'] ) ) {
        $id_count = intval( $_REQUEST['bulk_updated_featured_images'] );
        printf('<div id="message" class="updated fade">Updated %s featured images.</div>',
            $id_count);
    }
}

Answer 2

您必须创建一个新的single-post.php模板并为自定义字段添加php。您可以在子主题中添加新的single-post.php模板，以便主题更新不会覆盖它。

您可以使用此custom post generator来帮助您入门。首先调用子主题中的任何内容。所以在你的新自定义单一Post.php（但称之为custom-Post.php或类似的东西）中添加逻辑（如果...则）以渲染主题single-post.php。

然后在您的新自定义Post.php中添加此项以显示图像：

**<img src="<?php the_field('advanced_custom_field_name'); ?>" alt=""/>**。

custom-Post.php将添加html的图像标记，而高级自定义字段将填充URL。

或者，您的主题中可能有一个设置，允许您在单个帖子显示中呈现特色图像。

在wordpress中设置自定义字段的特色图像

2 个答案: