下面的函数计算文件大小，只需更改“/myfile/image”。jpg\'和您的特色图像变量。

   <?php 
    function file_size($url){ 
        $size = filesize($url); 
        if($size >= 1073741824){ 
            $fileSize = round($size/1024/1024/1024,1) . \'GB\'; 
        }elseif($size >= 1048576){ 
            $fileSize = round($size/1024/1024,1) . \'MB\'; 
        }elseif($size >= 1024){ 
            $fileSize = round($size/1024,1) . \'KB\'; 
        }else{ 
            $fileSize = $size . \' bytes\'; 
        } 
        return $fileSize; 
    }


    $feat_image = wp_get_attachment_url( get_post_thumbnail_id($post->ID) );

   //echo file_size(\'/myfile/image.jpg\');
     echo file_size($feat_image);  
    ?>