PHP 图像尺寸调整代码

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我是靠谱客的博主善良小白菜，最近开发中收集的这篇文章主要介绍PHP 图像尺寸调整代码，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

 
/********************** 
*@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; 
} 