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<?php 
function createthumb($name,$filename,$new_w,$new_h)
    {
    $system=explode('.',$name);
    if (preg_match('/jpg|jpeg|JPG|JPEG/',$system[3])){
        $src_img=imagecreatefromjpeg($name);
    }
    if (preg_match('/gif|GIF/',$system[3])){
        $src_img=imagecreatefromgif($name);
    }
    if (preg_match('/png|PNG/',$system[3])){
        $src_img=imagecreatefrompng($name);
    }

    $old_x=imageSX($src_img);
    $old_y=imageSY($src_img);
    if ($old_x > $old_y) {
        $thumb_w=$new_w;
        $thumb_h=$old_y*($new_h/$old_x);
    }
    if ($old_x < $old_y) {
        $thumb_w=$old_x*($new_w/$old_y);
        $thumb_h=$new_h;
    }
    if ($old_x == $old_y) {
        $thumb_w=$new_w;
        $thumb_h=$new_h;
    }

    $dst_img = imagecreatetruecolor($thumb_w,$thumb_h);
    imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 
    $red = imagecolorallocate($dst_img, 255, 0, 0);
    $green = imagecolorallocate($dst_img, 0, 255, 0);
    $blue = imagecolorallocate($dst_img, 0, 0, 255);
    $black = imagecolorallocate($dst_img, 0, 0, 0);
    // Make the background transparent
    imagecolortransparent($dst_img, $black);

    // Draw a red rectangle
    imagefilledrectangle($dst_img, 4, 4, 50, 25, $red, $green, $blue);


    if (preg_match("/png|PNG/",$system[3])){        
        imagepng($dst_img, './imagecolortransparent.png', 100); 
    } else if (preg_match("/gif|GIF/",$system[3])) {
        imagegif($dst_img, './imagecolortransparent.gif', 100); 
    } else {
        imagejpeg($dst_img,$filename, 100); 
    }
    imagedestroy($dst_img); 
    imagedestroy($src_img); 
} 
?>