在WordPress中生成所有旧的PDF预览图像

Posted 2021-02-22

From WordPress 4.7 when you upload a PDF it generates jpg previews. All pdf will remain without previews, or you can use this script to generate previews.

include 'wp-load.php';
include 'wp-admin/includes/image.php';
 
if ( !current_user_can( 'edit_others_pages' )) die("Not authorized.");
$attachments = $wpdb->get_results("select * from wp_posts where post_mime_type='application/pdf'");
if ($attachments) {
    foreach ($attachments as $attachment) {
        $filename = str_replace("http://".$_SERVER['HTTP_HOST'], $_SERVER['DOCUMENT_ROOT'], $attachment->guid);
        echo $filename."<br/>
";
        $metadata = wp_generate_attachment_metadata($attachment->ID, $filename);
        wp_update_attachment_metadata($attachment->ID, $metadata);
    }
}