Php 调整图像大小并裁剪图像

我想调整大小和作物的形象。250x250

我可以调整它的大小：

    $newfilename = "image.jpg";
    if(isset($_POST['submit'])){
      if (isset ($_FILES['new_image'])){
          $imagename = $newfilename;
          $source = $_FILES['new_image']['tmp_name'];
          $target = "img/".$imagename;
          move_uploaded_file($source, $target);  

          $imagepath = $imagename;
          $save = "img/" . $imagepath; 
          $file = "img/" . $imagepath; 

          list($width, $height) = getimagesize($file) ; 


          $modwidth = 250; 

          $diff = $width / $modwidth;

          $modheight = $height / $diff; 
          $tn = imagecreatetruecolor($modwidth, $modheight) ; 
          $image = imagecreatefromjpeg($file) ; 
          imagecopyresized($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;  

          imagejpeg($tn, $save, 100) ; 

      }
    }

但我不知道调整大小后如何裁剪。 它能塑造形象。如果我有10000x1000的图像，这是个错误的决定

 imagecopyresized($tn, $image, 0, 0, 0, 0, 250, 250, 250, 250) ; 

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您只需使用PHP获取图像并以HTML格式回显它们，并对它们应用特定的宽度/高度。

使用

imagecreatetruecolor

创建具有指定裁剪大小的新图像，然后使用

imagecopy

将其从旧画布复制到新画布

示例（未测试）：

---

试着用crupie。github url是

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我用过它，效果很好

这根本不是他想要的，老实说，这是一种非常懒惰和浪费的方式只裁剪原始图像，然后将

imagecopy

更改为

imagecopy（$croped，$tn，0，0，$cropLeft，$cropTop，$modwidth，$modheight）他要求的是后端解决方案，而不是另一个npm包。
$newfilename = "image.jpg";
if(isset($_POST['submit'])){
  if (isset ($_FILES['new_image'])){
      $imagename = $newfilename;
      $source = $_FILES['new_image']['tmp_name'];
      $target = "img/".$imagename;
      move_uploaded_file($source, $target);  

      $imagepath = $imagename;
      $save = "img/" . $imagepath; 
      $file = "img/" . $imagepath; 

      list($width, $height) = getimagesize($file) ; 


      $modwidth = 250; 

      $diff = $width / $modwidth;

      $modheight = $height / $diff; 
      $tn = imagecreatetruecolor($modwidth, $modheight) ; 
      $cropped = imagecreatetruecolor(250, 250);
      $cropLeft = 0; // start from left
      $cropTop = 0; // start from top

      $image = imagecreatefromjpeg($file) ; 
      imagecopyresized($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;  
      imagecopy($cropped, $image, 0, 0, $cropLeft, $cropTop, $modwidth, $modheight);

      imagejpeg($cropped, $save, 100); // save cropped image
      // imagejpeg($tn, $save, 100) ;  // save resized image

  }
}