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<?php
function crop_image($image_path, $crop_to_width, $crop_to_height)
{    
    $dimensions = getimagesize($image_path);
    $image_width = $dimensions[0];
    $image_height = $dimensions[1];
    
    $start_offset_width = ($image_width / 2) - ($image_width / 4);
    $start_offset_height = ($image_height / 2) - ($image_height / 3);
    
    if($crop_to_width > 400)
    {
        $start_offset_width = ($image_width / 2) - ($image_width / 2);
        $start_offset_height = ($image_height / 2) - ($image_height / 2);
    }
    
    $zoom = 1;
    if(isset($_GET["p"]))
    {
        $zoom = $_GET["p"];
    }
    
    $image_temp = imagecreatefromjpeg($image_path);
    
    $thumb_size_height = $crop_to_height;
    $thumb_size_width = $crop_to_width;
    
    $image_p = imagecreatetruecolor($thumb_size_width, $thumb_size_height);
    
    imagecopyresampled($image_p,$image_temp, 0,0,$start_offset_width,$start_offset_height,
                       $thumb_size_width,$thumb_size_height,$thumb_size_width * $zoom,$thumb_size_height * $zoom);
    
    header('Content-type: image/jpeg');
    imagejpeg($image_p);
    imagedestroy($image_p); 
}
crop_image($_GET["i"], $_GET["w"], $_GET["h"]);
?>