我想在我的以下代码中压缩图像大小并修复500 * 500的大小

Question

这是一个添加图像部分代码，适用于jquery数组图像上传，我正在尝试将高度500设置为500宽度并调整imag的大小

        {
            $imgfield = "file".$i;
            if($_FILES[$imgfield]['size'] != 0)
                {
                      $errors= array();
                      $file_size =$_FILES[$imgfield]['size'];
                      $file_tmp =$_FILES[$imgfield]['tmp_name'];
                      $file_type=$_FILES[$imgfield]['type'];

                  $file_ext=strtolower(end(explode('.',$_FILES[$imgfield]['name'])));
                $photo_name = $member_id."_".time()."_".$i.".".$file_ext;


                      $expensions= array("jpeg","jpg","png");

                      if(in_array($file_ext,$expensions)=== false){
                         $errors[]="extension not allowed, please choose a JPEG or PNG file.";
                      }

                      if($file_size > 2097152)]{
                         $errors[]='File size must be excately 2 MB'
                      }

                      if(empty($errors)==true){
                         move_uploaded_file($file_tmp,"images/user/product photo/temp/".$photo_name);
                         $images[] = $photo_name;
                         echo "Success";
                      }else{
                        $error="Your Image Size is more then 2 MB , Please Reduce Your Image Size and Upload Again.";
                      }
                }
        }