创建图像缩略图需要许多时间,此代码将有助于了解缩略图的逻辑。
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”)
$im = imagecreatefrompng
*@filename – path to the image
*@tmpname – temporary path to thumbnail
*@xmax – max width
*@ymax – max height
*/
function resize_image($filename, $tmpname, $xmax, $ymax)
{
$ext = explode(“.”, $filename);
$ext = $ext[count($ext)-1];
if($ext == “jpg” || $ext == “jpeg”)
$im = imagecreatefromjpeg($tmpname);
elseif($ext == “png”)
$im = imagecreatefrompng
来源gao!%daima.com搞$代*!码网
($tmpname);
elseif($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;
}
这里是摘自gaodaima搞代码网之前发布的文章。更多的技巧可以参考。
收集的二十一个实用便利的PHP函数代码
以上就是PHP 图像尺寸调整代码的详细内容,更多请关注gaodaima搞代码网其它相关文章!