resize crop png jpg jpeg gif php

<?php

class SimpleImage {

   var $image;
   var $image_type;

   function load($filename) {
      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {
         $this->image = imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {
         $this->image = imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {
         $this->image = imagecreatefrompng($filename);
      }
   }
   function save($filename, $image_type=IMAGETYPE_JPEG, $compression=100, $permissions=null) {
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {
         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {
         imagepng($this->image,$filename);
      }
      if( $permissions != null) {
         chmod($filename,$permissions);
      }
   }
   function output($image_type=IMAGETYPE_JPEG) {
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {
         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {
         imagepng($this->image);
      }
   }
   function getWidth() {
      return imagesx($this->image);
   }
   function getHeight() {
      return imagesy($this->image);
   }
   function resizeToHeight($height) {
      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }
   function resizeToWidth($width) {
      $ratio = $width / $this->getWidth();
      $height = $this->getHeight() * $ratio;
      $this->resize($width,$height);
   }
   function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }
   function resize($width,$height) {
        $new_image = imagecreatetruecolor($width, $height);
        $bg = imagecolorallocate($new_image,255,255,255);
        imagefill($new_image,0,0,$bg);
        imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
        $this->image = $new_image;
   }
    function crop($filename,$width,$height)
    {
        list($w, $h, $type, $attr) = getimagesize($filename);

        if( $this->image_type == IMAGETYPE_JPEG ) {
            $src_im = imagecreatefromjpeg($filename);
        } elseif( $this->image_type == IMAGETYPE_GIF ) {
            $src_im = imagecreatefromgif($filename);
        } elseif( $this->image_type == IMAGETYPE_PNG ) {
            $src_im = imagecreatefrompng($filename);
        }


        $src_x = '0';   // begin x
        $src_y = '0';   // begin y
        $src_w = $width; // width
        $src_h = $height; // height
        $dst_x = '0';   // destination x
        $dst_y = '0';   // destination y

        $new_image = imagecreatetruecolor($src_w, $src_h);
        $white = imagecolorallocate($new_image, 255, 255, 255);
        imagefill($new_image, 0, 0, $white);

        imagecopy($new_image, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h);
        $this->image = $new_image;
    }
}

$filename= "test.png";

$thumb = new SimpleImage();
$thumb->load($filename);
$thumb->resizeToWidth(120);
$thumb->crop($filename, 120, 120);
$thumb->save("test".$filename);




?>