$src_img=ImageCreateFrompng($cfg_fullsizepics_path."/".$entry);

// Class created by Carl "Mau" Vondrick
class Thumb {
    // * Public Properities * \\
    public $path,$scale=1;
    public $cache,$cache_path,$cache_prefix; // Cache properties
    public $real_width,$real_height;
    public $new_width,$new_height;
    public $image_r,$image_tr; /* Image Resources:
                                  $image_r = regular image resource
                                  $image_tr = thumb image resource
                                */
    
    // * Public Methods * \\
    public function __construct($path) {
        // Error checking
        if (!file_exists($path)) throw new Exception("File $path does not exist");
        
        $this->path = $path;
        
        list($this->real_width,$this->real_height) = getimagesize($this->path);
    }
        public function __destruct() {
        if (is_resource($this->image_r)) imagedestroy($this->image_r);
        if (is_resource($this->image_tr)) imagedestroy($this->imagetr);
    }
    
    // Method: set_target
    // Calculates percent based off of target
    // $dem, string, either 'h' or 'w'
    // $to, int, above 0
    public function set_target($dem,$to) {
        // Error checking
        if ($dem != 'h' && $dem != 'w') throw new Exception("Invalid dimension");
        if (!is_numeric($to) || $to <= 0) throw new Exception("To must be an int above 0.");
        
        // calculate scale based off of target
        if ($dem == 'h') $this->scale = $to / $this->real_height;
        else $this->scale = $to / $this->real_width;
    }
    
    // Method: set_percent
    // Sets the percent to be predefined
    // $to, int, above 0
    public function set_percent($to) {
        // Error checking
        if (!is_numeric($to) || $to <= 0) throw new Exception("To must be an int above 0");
    
        $this->scale = $to;
    }
    
    // Method: set_max
    // Adjusts the scale to the max
    // $dem, string, either 'h' or 'w'
    // $to, int, the max
    public function set_max($dem,$to) {
        // Error checking
        if ($dem != 'h' && $dem != 'w') throw new Exception("Invalid dimension");
        if (!is_numeric($to) || $to <= 0) throw new Exception("To must be an int above 0.");
    
        $this->calculate_new_dems();
        
        if ($dem == 'h' && $to < $this->new_height)  $this->scale = $to / $this->real_height;
        elseif ($dem == 'w' && $to < $this->new_width)  $this->scale = $to / $this->real_width;
    }
    
    // Method no_huge
    // Adjusts the scale so it does not go above 100%
    // No atr
    public function no_huge() {
        if ($this->scale > 1) $this->scale = 1;
    }
    
    // Method output
    // Outputs the image
    // $cache, bool, wether to pull from cache if possible
    public function output($cache=true) {
        if (headers_sent()) throw new Exception("Headers already sent.  Not sending image binary.");
        header("Content-type: image/jpeg");
    
        if ($this->scale == 1) { // image does not need to be scaled, so let's just output
            print file_get_contents($this->path);
        }
        else {
            if (!$this->cache_exists()) $this->create_image();
            elseif (!$cache) $this->create_image();
            
            print file_get_contents($this->cache_path.'/'.$this->get_cache_lookup());
        }
    }
    
    // * Protected Methods * \\
    protected function create_image() {
        $this->calculate_new_dems();
    
        $this->image_tr = imagecreatetruecolor($this->new_width, $this->new_height);
        $this->image_r = imagecreatefromjpeg($this->path);
        
        imagecopyresampled($this->image_tr,$this->image_r,0, 0, 0, 0,$this->new_width,$this->new_height,$this->real_width,$this->real_height);
    
        imagejpeg($this->image_tr,$this->cache_path.'/'.$this->get_cache_lookup());
        
        imagedestroy($this->image_tr);
        imagedestroy($this->image_r);
    }
    protected function calculate_new_dems() {
        $this->new_height = $this->real_height * $this->scale;
        $this->new_width = $this->real_width * $this->scale;
    }
    protected function cache_exists() {
        return file_exists($this->cache_path.'/'.$this->get_cache_lookup());
    }
    protected function get_cache_lookup() {
        return sha1($this->path.' '.$this->scale);
    }
}  

try {
    
    $thumb = new Thumb("../clients/sam/images/sam.jpg");
    
    $thumb->set_target('h',500); // Tries to make the image with a height of 500
    $thumb->set_max('h',400); // Makes sure that the image height is no greater than 400
    $thumb->no_huge(); // Scales image to 100% if it is above 100%
    $thumb->set_percent(2); // Sets the image to 200%
    $thumb->cache_path = $_SERVER['DOCUMENT_ROOT']; // no trailing slash
    $thumb->output(true);
}
catch (Exception $ex) {
    print '<strong>Sorry!  This page cannot continue processing.  The exception \'Exception\' was caught.</strong><br /><em>Message: </em> '.$ex->getMessage();
    die;
}