PHP Thumbnail Generator

function thumb_image_upload($name , $tmp_name , $upload_dir=”){
$ext = end(explode(“.”,$name));
$name_arr = explode(“.”,$name);
$new_file_name = $name_arr[0].date(“Y-m-d-H-i-s”);
$new_file_name_with_ext = $new_file_name.”.”.$ext;

$add = “../upload/q_images/”.$new_file_name_with_ext; //original image folder directory
$upload_path = “../upload/q_thumb/”.$new_file_name_with_ext;//thumbnail image directory
$n_width=200;//width of the new image
$n_height=200;//height of the image
$error_msg = “”;
if($ext==”gif”)
{
$im=imagecreatefromgif($add);
$width=imagesx($im); // Original picture width is stored
$height=imagesy($im); // Original picture height is stored

$t_width = $n_width; $t_height = $n_height;

if($width>$height){
$ratio = $width / $height;
$t_width = $n_width;
$t_height = $n_height / $ratio;
}
if($width$height){
$ratio = $width / $height;
$t_width = $n_width;
$t_height = $n_height / $ratio;
}
if($width$height){
$ratio = $width / $height;
$t_width = $n_width;
$t_height = $n_height / $ratio;
}
if($width<$height){
$ratio = $width / $height;
$t_width = $n_width * $ratio ;
$t_height = $n_height;
}

$newimage=imagecreatetruecolor($t_width,$t_height);
imagecopyresized($newimage,$im,0,0,0,0,$t_width,$t_height,$width,$height);
imagepng($newimage,$upload_path);
chmod(“$upload_path”,0777);

}
else
{
$error_msg = “you have to upload gif,png,jpg,jpeg”;
}
return $error_msg;
}