PHP gets image details (width, height, format, size)

function getImageInfo($img) //$img为图像文件绝对路径
{
    $img_info = getimagesize($img);
    switch ($img_info[2]) {
        case 1:
            $imgtype = "GIF";
            break;
        case 2:
            $imgtype = "JPG";
            break;
        case 3:
            $imgtype = "PNG";
            break;
    }
    $img_type = $imgtype . "图像";
    $img_size = ceil(filesize($img) / 1000) . "k"; //获取文件大小

    $new_img_info = array(
        "width" => $img_info[0],
        "height" => $img_info[1],
        "type" => $img_type,
        "size" => $img_size
    );
    print " width";
    print $img_info[0];
    print " height";
    print $img_info[1];
    print " format";
    print $img_type;
    print " size";
    print $img_size;
    print $new_img_info;
}

$img = "/www/htdocs/images/jf.gif";
getImageInfo($img);
?>

php