- function resize_image($filename, $tmpname, $xmax, $ymax)
- {
- $ext = explode(".", $filename);
- $ext = $ext[count($ext)-1];
- if($ext == "jpg" || $ext == "jpeg")
- $im = imagecreatefromjpeg($tmpname);
- elseif($ext == "png")
- $im = imagecreatefrompng($tmpname);
- elseif($ext == "gif")
- $im = imagecreatefromgif($tmpname);
- $x = imagesx($im);
- $y = imagesy($im);
- if($x <= $xmax && $y <= $ymax)
- return $im;
- if($x >= $y) {
- $newx = $xmax;
- $newy = $newx * $y / $x;
- }
- else {
- $newy = $ymax;
- $newx = $x / $y * $newy;
- }
- $im2 = imagecreatetruecolor($newx, $newy);
- imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
- return $im2;
- }
- //该片段来自于http://www.codesnippet.cn/detail/280220132254.html
来源: http://www.codesnippet.cn/detail/280220132254.html