ท่านใดใช้ฟังก์ชั่น adaptiveResize() เป็นช่วยสอนผมหน่อยครับ

<?php
include("../connect_db.php");

		$topic = $_POST['txttopic'];
		$detail = $_POST['txadetail'];
		$date = date("d/m/y");
		$timer = date("H:i:s");
							
				$filename = $_FILES['fphoto']['name'];
				$tmpname = $_FILES['fphoto']['tmp_name'];
				$storefile = "./salaya_ad/images/news/".$filename;		
				
				if($_FILES['fphoto']['name']){
					copy($tmpname, $filename);
					@unlink($tmpname);
					
					try {
						$thumb = PhpThumbFactory::create("./salaya_ad/images/news/$filename");
						$thumb->adaptiveResize(100, 100);
						$thumb->save("./salaya_ad/images/news/$filename");
					}
				}
														
					$addnews = "insert into news values (null,'$topic','$detail','$filename','$date','$timer')";
					$runadd = mysql_query($addnews) or die ("not run addnews");
						if($runadd)
						{
							header("location:news_ad.php");
						}
?>