Resize Images with Simple PHP Class

Put this class somewhere in a common function file or in the header of script: 

OR Include file

  <?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=75, $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, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
   }

   function resizeTransparentImage($width,$height) {
    $new_image = imagecreatetruecolor($width, $height);
    if( $this->image_type == IMAGETYPE_GIF || $this->image_type == IMAGETYPE_PNG ) {
        $current_transparent = imagecolortransparent($this->image);
        if($current_transparent != -1) {
            $transparent_color = imagecolorsforindex($this->image, $current_transparent);
            $current_transparent = imagecolorallocate($new_image, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
            imagefill($new_image, 0, 0, $current_transparent);
            imagecolortransparent($new_image, $current_transparent);
        } elseif( $this->image_type == IMAGETYPE_PNG) {
            imagealphablending($new_image, false);
            $color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);
            imagefill($new_image, 0, 0, $color);
            imagesavealpha($new_image, true);
        }
    }
    imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
    $this->image = $new_image; 
  }

}
?>

 

 

 

 

Example 1 :

 

The first example below will load a file named picture.jpg resize it to 250 pixels wide and 400 pixels high and resave it as picture2.jpg

<?php
   $file_location = '/var/www/yourwebsite/uploads/'; # Image folder Path
  $image = new SimpleImage();
   $image->load($file_location.$file_location.'picture.jpg');
   $image->resize(250,400);
   $image->save('picture2.jpg');
?>

Example 2 :

If you want to resize to a specifed width but keep the dimensions ratio the same then the script can work out the required height for you, just use the resizeToWidth function.

<?php
   $file_location = '/var/www/yourwebsite/uploads/'; # Image folder Path
  $image = new SimpleImage();
   $image->load($file_location.'picture.jpg');
   $image->resizeToWidth(250);
   $image->save('picture2.jpg');
?>

 

Example 3 :

The following example will resize and save an image which has been uploaded via a form

<?php
   if( isset($_POST['submit']) ) {
      $image = new SimpleImage();
      $image->load($_FILES['uploaded_image']['tmp_name']);
      $image->resizeToWidth(150);
      $image->output();
   } else {

?>

   <form action="" method="post" enctype="multipart/form-data">
      <input type="file" name="uploaded_image" />

      <input type="submit" name="submit" value="Upload" />

   </form>

<?php
   }
?>