PHP按最大宽高缩略图片函数代码分享

很简单的按照最大宽高来缩略图片的代码，方便新手和懒得自己写的人。 [php]function thumb($imagefile, $maxwidth, $maxheight) { $dim = getimagesize($imagefile); $width = $dim[0]; //原图宽度 $height = $dim[1]; //原图高度 $original = imagecreatefromjpeg($imagefile);

$thcrown = $maxwidth/$maxheight;	//缩略图最大宽度与最大高度比
$crown = $width/$height;	//原图宽高比
if($crown/$thcrown >= 1){
	$thumbWidth = $maxwidth;
	$thumbHeight = $maxwidth/$crown;
} else {
	$thumbHeight = $maxheight;
	$thumbWidth = $maxheight*$crown;
}

$thumb = imagecreatetruecolor($thumbWidth, $thumbHeight);
imagecopyresampled($thumb, $original, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $width, $height);
return $thumb;

}[/php]