php如何使用gd减少文件大小并上传到文件夹

Question

如何压缩每个图像文件的文件大小并使用foreach移动到文件夹。如何在php中使用gd扩展来实现这一点？

这是我的代码：

if($_POST['image_form_submit'] == 1) {
    $galleryGroup = filter_var($_POST['galleryGroup'], FILTER_SANITIZE_NUMBER_INT);

    $images_arr = array();

    foreach ($_FILES['images']['name'] as $key => $val)
    {
        $image_name = $_FILES['images']['name'][$key];
        $tmp_name   = $_FILES['images']['tmp_name'][$key];
        $size       = $_FILES['images']['size'][$key];
        $type       = $_FILES['images']['type'][$key];
        $error       = $_FILES['images']['error'][$key];

        //Upload Temporary Directory
        $target_dir = "../uploads/gallery/";

        $target_file = $target_dir . $_FILES['images']['name'][$key];




        if (move_uploaded_file($_FILES['images']['tmp_name'][$key], $target_file))
        {
            $images_arr[] = $target_file;
        }
        $sqlMaxSO = "SELECT MAX(so) as maxSO FROM gallery_listing";

        $Maxres = mysqli_query($con, $sqlMaxSO);

        $row = mysqli_fetch_assoc($Maxres);

        $maxSO = $row['maxSO'];


        $sql = "INSERT INTO gallery_listing (idGroup, imgImage, so, active) VALUES (" . $galleryGroup . " , '" .  $image_name. "', '" . $maxSO . "', 1);";

        $res = mysqli_query($con, $sql);
    }