缩略图生成的php程序

客户端上载的页面：

-------------------- upload.htm ---------------------

<form enctype="multipart/form-data"

method="post" action="upload.php">

<input type="hidden" name="MAX_FILE_SIZE" value="10240000000">请选择或输入上传文件名:<input name="upfile" type="file">

<input type="submit" value="开始上传">

--------------------- upload.php -------------------

<?
if(empty($upfile)){

print("No file was transfered!\n无文件上传!");

exit;

}

$image_path=$upfile;

@$image_info=getimagesize($image_path);

if($image_info[2]==2)

{@$image2=imagecreatefromjpeg($image_path);

}

else if($image_info[2]==1){

@$image2=imagecreatefromgif($image_path);

}

else

if(empty($image2))

$image2_x=imagesx($image2);

$image2_y=imagesy($image2);

if($image2_x==$image2_y){

$x=150;

$y=0;

}

else if($image2_x>$image2_y){

$x=150;

$y=intval(150*$image2_y/$image2_x);

}

else{

$y=150;

$x=intval(150*$image2_x/$image2_y);

}

$image1=imagecreate($x,$y);

imagecopyresized($image1,$image2,0,0,0,0,$x,$y,$image2_x,$image2_y);

imagegif($image1,"new.gif");

?>