php调整图像尺寸的代码
时间：2021-07-01 10:21:17
帮助过：3人阅读
/********************** - *@filename - path to the image
- *@tmpname - temporary path to thumbnail
- *@xmax - max width
- *@ymax - max height
- */
- 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;
- }
- ?>
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