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<?php 
header('X-UA-Compatible: IE=edge,chrome=1');
function createthumb($name,$filename,$new_w,$new_h)
    {
    
    $width = getWidth($filename);
    $height = getHeight($filename);

    if ($width > $new_w){
        $scale = $new_w/$width;
    }elseif ($height > $new_h){
        $scale = $new_h/$height;
    }else{
        $scale = 1;
    }
        $name = resizeImage($filename,$width,$height,$scale);

} 

function getHeight($image) {
    $size = getimagesize($image);
    $height = $size[1];
    return $height;
}
function getWidth($image) {
    $size = getimagesize($image);
    $width = $size[0];
    return $width;
}

function resizeImage($image,$width,$height,$scale) {
    list($imagewidth, $imageheight, $imageType) = getimagesize($image);
    $imageType = image_type_to_mime_type($imageType);
    $newImageWidth = ceil($width * $scale);
    $newImageHeight = ceil($height * $scale);
    $newImage = imagecreatetruecolor($newImageWidth,$newImageHeight);

    // Make the background transparent
    if ($imageType == 'image/gif') {
        $transparent = imagecolorallocate($newImage, 0, 0, 0);
        imagecolortransparent($newImage, $transparent);
    }    else    {
        imagealphablending($newImage, false);
        imagesavealpha($newImage, true);
        $trans_colour = imagecolorallocatealpha($newImage, 0, 0, 0, 127);
        imagefill($newImage, 0, 0, $trans_colour);
    }

    switch($imageType) {
        case "image/gif":
            $source=imagecreatefromgif($image); 
            break;
        case "image/pjpeg":
        case "image/jpeg":
        case "image/jpg":
            $source=imagecreatefromjpeg($image); 
            break;
        case "image/png":
        case "image/x-png":
            $source=imagecreatefrompng($image); 
            break;
      }
    imagecopyresampled($newImage,$source,0,0,0,0,$newImageWidth,$newImageHeight,$width,$height);
    
    switch($imageType) {
        case "image/gif":
              imagegif($newImage,$image); 
            break;
          case "image/pjpeg":
        case "image/jpeg":
        case "image/jpg":
              imagejpeg($newImage,$image,100); 
            break;
        case "image/png":
        case "image/x-png":
            imagepng($newImage,$image);  
            break;
    }
    
    //chmod($image, 0775);
    return $image;
}
?>