PHP Image class with data_uri, resize, crop, watermark, scale, fitTosize

PHP Image manipulation class almost every options in this class.

Following features are included in this PHP class. 

• data_uri

• getWidth

• getHeight

• resizeToHeight

• resizeToWidth

• scale

• crop

• resize

• addWatermark

• fitToSize

<?php


/*
Written by: Jailani M, http://www.W3Lessons.com
w3_image Image Manipulation Class 
*/
class w3_image {

   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) {
    

imagecolortransparent($this->image, imagecolorallocatealpha($this->image, 0, 0, 0, 127));
imagealphablending($this->image, false);
imagesavealpha($this->image, true);

    
      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) {
  
  imagecolortransparent($this->image, imagecolorallocatealpha($this->image, 0, 0, 0, 127));
  imagealphablending($this->image, false);
  imagesavealpha($this->image, true);  
    
  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 data_uri($image_type=IMAGETYPE_JPEG) {
  
  imagecolortransparent($this->image, imagecolorallocatealpha($this->image, 0, 0, 0, 127));
  imagealphablending($this->image, false);
  imagesavealpha($this->image, true);  
   ob_start();
  if( $image_type == IMAGETYPE_JPEG ) {
  $mime="image/jpeg";
  imagejpeg($this->image);
  } elseif( $image_type == IMAGETYPE_GIF ) {
  $mime="image/gif";   
  imagegif($this->image);         
  } elseif( $image_type == IMAGETYPE_PNG ) {
  $mime="image/png";   
  imagepng($this->image);
  }
  $image_data= ob_get_clean();
  $base64=base64_encode($image_data);
  return "data:$mime;base64,$base64";
 } 
   
   
   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, $height);
  imagealphablending($new_image, false);
  imagesavealpha($new_image, true);   
     imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
     $this->image = $new_image;   
   }  
   
   function crop($left,$top,$width,$height)
   {
 // create a blank image having the same width and height as the crop area
    // this will be our cropped image
    $cropped_image = imagecreatetruecolor($width, $height);
 $bgwhite = imagecolorallocatealpha($cropped_image,255,255,255,0);
 imagefilledrectangle($cropped_image, 0, 0,$width,$height, $bgwhite);
    // copy the crop area from the source image to the blank image created above
    imagecopy($cropped_image, $this->image, 0, 0, $left, $top,$width, $height);
  $this->image = $cropped_image;
   }
   
   function addWatermark($watermark_image,$position="B_RIGHT")
   {
    // T_LEFT, T_RIGHT, B_LEFT, B_RIGHT
    
  ImageAlphaBlending($this->image, true); 
  
  // Same Size PNG Watermark Image with Transparency
  $logoImage = ImageCreateFromPNG($watermark_image); 
  $logoW = ImageSX($logoImage); 
  $logoH = ImageSY($logoImage); 
  
  if($position == "T_LEFT")
  {
  $dst_x = 0;
  $dst_y = 0;
  }elseif($position == "T_RIGHT")
  {
  $dst_x = $this->getWidth()-$logoW;
  $dst_y = 0;
  }elseif($position == "B_LEFT")
  {
  $dst_x = 0;
  $dst_y = $this->getHeight()-$logoH;   
  }elseif($position == "B_RIGHT")
  {
  $dst_x = $this->getWidth()-$logoW;
  $dst_y = $this->getHeight()-$logoH;
  }
  
  
  // were you see the two 1's this is the offset from the top-left hand corner!
  ImageCopy($this->image, $logoImage, $dst_x, $dst_y, 0, 0, $logoW, $logoH);  
   }
   
   function fitToSize($width,$height)
   {
 // create a blank image having the same width and height fitToSize
    // this will be our final image
    $fitToImage = imagecreatetruecolor($width, $height);
 $bgwhite = imagecolorallocatealpha($fitToImage,255,255,255,0);
 imagefilledrectangle($fitToImage, 0, 0,$width,$height, $bgwhite);
    // resize image based on fit to size in both height and width
 $this->resizeToWidth($width);
 
 if($this->getHeight() > $height)
 $this->resizeToHeight($height); 
 
 $_x = ($width - $this->getWidth())/2;
 $_w = $this->getWidth();
 
 $_y = ($height - $this->getHeight()) / 2; 
 $_h = $this->getHeight();
 
 imagecopy($fitToImage,$this->image,$_x,$_y,0,0,$_w,$_h);
  $this->image = $fitToImage;
   }
}