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
- 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;
- }
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