<? 

$FILENamE="image_name"; 

// 生成图片的宽度 
$RESIZEWIDTH=400; 

// 生成图片的高度 
$RESIZEHeiGHT=400; 

//生成图片的路径 
$uploaddir="c:/winnt/temp"; 

function ResizeImage($im,$maxwidth,$maxheight,$name){ 
global $uploaddir; 
$width = imagesx($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, $newwidth, $newheight, $width, $height); 
}else{ 
$newim = imagecreate($newwidth, $newheight); 
imagecopyresized($newim, $height); 
} 
ImageJPEg ($newim,$uploaddir.$name . ".jpg"); 
ImageDestroy ($newim); 
}else{ 
ImageJpeg ($im,$uploaddir.$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>