Wordpress file size

filesize.php

/* get width and height */
  $file= wp_get_attachment_image_src( 1118, 'medium');
  $image_width= $file[1];
  $image_height= $file[2];
  
  /*get file size */
  $filemeta= wp_get_attachment_metadata(1118); //1118 is attachment ID
  $upload_dir= wp_upload_dir();
  
  $filemeta_array = explode("/", $filemeta['file']);
  
  $baseurl= $upload_dir['basedir'];
  $year_upload = $filemeta_array[0];
  $month_upload = $filemeta_array[1];  
  $filename= $filemeta['sizes']['medium']['file']; //change medium to your thumbnail size name
  
  $file_local_url= $baseurl.'/'.$year_upload.'/'.$month_upload.'/'.$filename; //it's because filesize() need relative path
  
  $attachment_filesize = filesize($file_local_url);
  
  echo $attachment_filesize; //print filesize in bytes.
  
  
  /* Function Converts bytes into human readable file size. */
  
  function FileSizeConvert($bytes) {
    $bytes = floatval($bytes);
        $arBytes = array(
            0 => array(
                "UNIT" => "TB",
                "VALUE" => pow(1024, 4)
            ),
            1 => array(
                "UNIT" => "GB",
                "VALUE" => pow(1024, 3)
            ),
            2 => array(
                "UNIT" => "MB",
                "VALUE" => pow(1024, 2)
            ),
            3 => array(
                "UNIT" => "KB",
                "VALUE" => 1024
            ),
            4 => array(
                "UNIT" => "B",
                "VALUE" => 1
            ),
        );

    foreach($arBytes as $arItem)
    {
        if($bytes >= $arItem["VALUE"])
        {
            $result = $bytes / $arItem["VALUE"];
            $result = str_replace(".", "," , strval(round($result, 2)))." ".$arItem["UNIT"];
            break;
        }
    }
    return $result;
}

echo FileSizeConvert($attachment_filesize); //print human readable file size