刚接触php的时候一个 大哥 给了个函数，具体忘了！以下 是我后来的记忆！

[php] function thumb($srcFile,$dstFile,$dstW,$dstH){
//$srcFile:源文件名称
//$dstFile:目标文件名称
//$dstW:目标宽
//$dstH:目标高
$data=GetImageSize($srcFile,&$info);
switch($data[2]){
case 1:
$im=@ImageCreateFromGIF($srcFile);
break;
case 2:
$im=@ImageCreateFromJPEG($srcFile);
break;
case 3:
$im=@ImageCreateFromPNG($srcFile);
break;
}
$srcW=ImageSX($im);
$srcH=ImageSY($im);
$ni=imagecreatetruecolor($dstW,$dstH);
$black=imagecolorallocate($ni,255,255,255);
imagefilledrectangle($ni,0,0,$dstW,$dstH,$black);
ImageCopyResized($ni,$im,0,0,0,0,$dstW,$dstH,$srcW,$srcH);
$newfile = $this->upload_des.$dstFile;


if (!is_dir($this->upload_des)) {
$oldmask = umask(0);
if (!mkdir($this->upload_des, 0777)) exit("Can't build the upload_des");
umask($oldmask);
}

imagegif($ni,$newfile,100);
}

[/php]当时的心情，能够用就好了！后来感觉效果不好，改进了以下！


[php] function thumbb($srcFile,$dstFile,$dstW,$dstH){
//$srcFile:源文件名称
//$dstFile:目标文件名称
//$dstW:目标宽
//$dstH:目标高
$data=GetImageSize($srcFile,&$info);
switch($data[2]){
case 1:
$im=@ImageCreateFromGIF($srcFile);
break;
case 2:
$im=@ImageCreateFromJPEG($srcFile);
break;
case 3:
$im=@ImageCreateFromPNG($srcFile);
break;
}
$srcW=ImageSX($im);
$srcH=ImageSY($im);
$ni=imagecreatetruecolor($dstW,$dstH);
$black=imagecolorallocate($ni,255,255,255);
imagefilledrectangle($ni,0,0,$dstW,$dstH,$black);
ImageCopyResized($ni,$im,0,0,0,0,$dstW,$dstH,$srcW,$srcH);
$newfile = $this->upload_deb.$dstFile;
if (!is_dir($this->upload_deb)) {
$oldmask = umask(0);
if (!mkdir($this->upload_deb, 0777)) exit("Can't build $upload_deb");
umask($oldmask);
}

switch($data[2]){
case 1:
imagegif($ni,$newfile,100);
break;
case 2:
imagejpeg($ni,$newfile,100);
break;
case 3:
imagepng($ni,$newfile,100);
break;
}


}
[/php]

效果有些改善，请大家看看！现在的如何，多谢指点！

我的想法，把自己的东西拿出来，无论好坏！多希望听到批评的语句，为了能够进步！