PHP 图像尺寸调整代码

PHP 2018-12-30

<div class="codetitle"><a style="CURSOR: pointer" data="36631" class="copybut" id="copybut36631" onclick="doCopy('code36631')"> 代码如下:

<div class="codebody" id="code36631">
/**
@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,$im,floor($newx),floor($newy),$x,$y);
return $im2;
}

这里是摘自编程之家之前发布的文章。更多的技巧可以参考。
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