如何在PHP上上传在服务器上压缩的图像

Question

我一直在尝试使用以下代码在上传时压缩图像，但无法确定在其中实现压缩代码的位置。求助。

$timestamp = date('Y-m-d:h:i:s');

if($_FILES['file1']['name']!="")
    {
        $sql_banner_id = "SELECT MAX(id) from autosale";
        $result_banner_id = mysql_query($sql_banner_id);
        $rs_banner_id = mysql_fetch_array($result_banner_id);
        if($rs_banner_id[0]==0)
        {
            $banner_id  = 1;
        }
        else
        {
            $banner_id = $rs_banner_id[0]+1;
        }
        $control_name = "file1";
        $target = "autosale_image";
        $new_name = "sale".$banner_id;
        $path = upload_all_photo($control_name, $target, $new_name, 80);
        $control_name = "file2";
        $target = "autosale_image";
        $new_name = "sale1".$banner_id;
        $path1 = upload_all_photo($control_name, $target, $new_name, 80);
    }
    $sql_add_directory = "INSERT INTO autosale
    (
        name , email , m_address, contact , city , country, c_companyname, model,  variant, km, description, price, image_path, image_path1, timestamp 
    ) 
    VALUES
    (
        '$name', '$emailid', '$address', '$mobile', '$city',  '$country', '$carmake', '$car_model','$variant', '$km', '$description', '$price', '$path', '$path1', '$timestamp'
    )";
    //echo $sql_add_directory;
    $result_add_directory = mysql_query($sql_add_directory) or die("error".mysql_error());
    //header("location:thanks_subscription.php"); // redirect for normal user
    echo "<script language='javascript'>window.location='thanks_autosale.php';</script>";