4:3 纵横比裁剪在 PHP 与 jQuery 插件

我想用PHP将图像裁剪为4：3的纵横比。我在设置中使用 http://odyniec.net/projects/imgareaselect/jQuery 插件，比例为 4：3。

这是php代码，我用于裁剪，但最终裁剪是黑色背景或比例。

<?php
/*
    Author = Sedat Göç
    Description : Crop and Filter Image use PHP and JQuery
    Author Mail : sedatgoc34@gmail.com
    Version : 1.0

*/
require("config.php");

$x = $_POST["x"];
$y = $_POST["y"];
$width = $_POST["width"]; 
$height = $_POST["height"];
$sWidth = $_POST["sWidth"]; 
$sHeight = $_POST["sHeight"]; 
$img = $_POST["img"];
$imageHash = md5($img+rand(0,999999));
$d = explode('/',$img);
$d = $d[count($d)-1];
list($wv, $hv) = getimagesize($imagePath.$d);
$ratio = $wv / $sWidth;

$newH = $width * $ratio;
$newW = $height * $ratio;
$newX = $x * $ratio;
$newY = $y * $ratio;

$image = imagecreatefrompng($imagePath.$d);
$dest = imagecreatetruecolor($newW, $newH);

imagecopy($dest, $image, 0, 0, $newX, $newY ,$newW,$newH);
imagepng($dest,$imageHashPath.$imageHash.'.png');
imagedestroy($image);
$c = explode($dir,($imageHashPath.$imageHash.'.png'));
echo $c[1];
?>

我需要什么才能在jQuery所选区域中获得最佳作物？

     $('#imageS').imgAreaSelect({
      aspectRatio: '4:3', 
      handles: true ,
      onSelectChange: function (img, selection) {
        x = selection.x1;
        y = selection.y1;
        width = selection.width;
        height = selection.height;      
    }
  });
 $("#crop").click(function(){
        if(width>=200){
            var sWidth = $("#imageS").width();
            var sHeight = $("#imageS").height();
            $.ajax({
              type: "POST",
              url: "tool/crop.php",
              data:{x:x,y:y,width:width,height:height,img:img,sWidth:sWidth,sHeight:sHeight},
              success: function(gelencevap){ 
                    $('#imageS').imgAreaSelect({
                            remove:true
                    });
                    $(".panel-title").html("Select Filter");
                    $("#imageS").hide();// hide imageS div
                    $("#crop").hide();// hide crop button
                    $('#imageT').show(); // show imageT div
                    $("#filters").show(); // show filter list
                    $("#imageT").attr("src",gelencevap);
                }
              });
        }
        else
        {
            alert("Please select.(min width 200px)");
        }
    });