@
manhere 你收的这个功能很强大，挺不错，不过还要安装
我在我发的那个地址里找到了一个符合我要求的一段，很简洁的，可以直接使用
保存为utf-8编码的时候出错了，改为ansi就正常了
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Resize image proportionaly where you give a max width or max height
<?php
header('Content-type: image/jpeg');
//$myimage = resizeImage('filename', 'newwidthmax', 'newheightmax');
$myimage = resizeImage('test.jpg', '150', '120');
print $myimage;
function resizeImage($filename, $newwidth, $newheight){
list($width, $height) = getimagesize($filename);
if($width > $height && $newheight < $height){
$newheight = $height / ($width / $newwidth);
} else if ($width < $height && $newwidth < $width) {
$newwidth = $width / ($height / $newheight);
} else {
$newwidth = $width;
$newheight = $height;
}
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
return imagejpeg($thumb);
}
?>
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