生成高质量的缩略图片

<?
$FILENAME="image_name";
// 生成图片的宽度
$RESIZEWIDTH=400;
// 生成图片的高度
$RESIZEHEIGHT=400;
function ResizeImage($im,$maxwidth,$maxheight,$name){
$width = imagesx($im);
$height = imagesy($im);
if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){
if($maxwidth && $width > $maxwidth){
$widthratio = $maxwidth/$width;
$RESIZEWIDTH=true;
}
if($maxheight && $height > $maxheight){
$heightratio = $maxheight/$height;
$RESIZEHEIGHT=true;
}
if($RESIZEWIDTH && $RESIZEHEIGHT){
if($widthratio < $heightratio){
$ratio = $widthratio;
}else{
$ratio = $heightratio;
}
}elseif($RESIZEWIDTH){
$ratio = $widthratio;
}elseif($RESIZEHEIGHT){
$ratio = $heightratio;
}
$newwidth = $width * $ratio;
$newheight = $height * $ratio;
if(function_exists("imagecopyresampled")){
$newim = imagecreatetruecolor($newwidth, $newheight);
imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
}else{
$newim = imagecreate($newwidth, $newheight);
imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
}
ImageJpeg ($newim,$name . ".jpg");
ImageDestroy ($newim);
}else{
ImageJpeg ($im,$name . ".jpg");
}
}
if($_FILES[';image';][';size';]){
if($_FILES[';image';][';type';] == "image/pjpeg"){
$im = imagecreatefromjpeg($_FILES[';image';][';tmp_name';]);
}elseif($_FILES[';image';][';type';] == "image/x-png"){
$im = imagecreatefrompng($_FILES[';image';][';tmp_name';]);
}elseif($_FILES[';image';][';type';] == "image/gif"){
$im = imagecreatefromgif($_FILES[';image';][';tmp_name';]);
}
if($im){
if(file_exists("$FILENAME.jpg")){
unlink("$FILENAME.jpg");
}
ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$FILENAME);
ImageDestroy ($im);
}
}
?>
<img src="<? echo($FILENAME.".jpg?reload=".rand(0,999999)); ?>"><br><br>
<form enctype="multipart/form-data" method="post">
<br>
<input type="file" name="image" size="50" value="浏览"><p>
<input type="submit" value="上传图片">
</form>
</body>
</html>

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哈哈哈！！！！你的IP是不是

？我都知道了！！！

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