本篇文章主要介绍php如何实现生成模糊图片，感兴趣的朋友参考下，希望对大家有所帮助。
代码如下：
<?php
class image_blur{
/**
* 图片高斯模糊（适用于png/jpg/gif格式）
* @param $srcimg 原图片
* @param $savepath 保存路径
* @param $savename 保存名字
* @param $positon 模糊程度
*
*基于martijn frazer代码的扩充， 感谢 martijn frazer
*/
public function gaussian_blur($srcimg,$savepath=null,$savename=null,$blurfactor=3){
$gdimageresource=$this->image_create_from_ext($srcimg);
$srcimgobj=$this->blur($gdimageresource,$blurfactor);
$temp = pathinfo($srcimg);
$name = $temp['basename'];
$path = $temp['dirname'];
$exte = $temp['extension'];
$savename = $savename ? $savename : $name;
$savepath = $savepath ? $savepath : $path;
$savefile = $savepath .'/'. $savename;
$srcinfo = @getimagesize($srcimg);
switch ($srcinfo[2]) {
case 1: imagegif($srcimgobj, $savefile); break;
case 2: imagejpeg($srcimgobj, $savefile); break;
case 3: imagepng($srcimgobj, $savefile); break;
default: return '保存失败'; //保存失败
}
return $savefile;
imagedestroy($srcimgobj);
}
/**
* strong blur
*
* @param $gdimageresource 图片资源
* @param $blurfactor 可选择的模糊程度
* 可选择的模糊程度 0使用 3默认 超过5时 极其模糊
* @return gd image 图片资源类型
* @author martijn frazer, idea based on http://stackoverflow.com/a/20264482
*/
private function blur($gdimageresource, $blurfactor = 3)
{
// blurfactor has to be an integer
$blurfactor = round($blurfactor);
$originalwidth = imagesx($gdimageresource);
$originalheight = imagesy($gdimageresource);
$smallestwidth = ceil($originalwidth * pow(0.5, $blurfactor));
$smallestheight = ceil($originalheight * pow(0.5, $blurfactor));
// for the first run, the previous image is the original input
$previmage = $gdimageresource;
$prevwidth = $originalwidth;
$prevheight = $originalheight;
// scale way down and gradually scale back up, blurring all the way
for($i = 0; $i < $blurfactor; $i += 1)
{
// determine dimensions of next image
$nextwidth = $smallestwidth * pow(2, $i);
$nextheight = $smallestheight * pow(2, $i);
// resize previous image to next size
$nextimage = imagecreatetruecolor($nextwidth, $nextheight);
imagecopyresized($nextimage, $previmage, 0, 0, 0, 0,
$nextwidth, $nextheight, $prevwidth, $prevheight);
// apply blur filter
imagefilter($nextimage, img_filter_gaussian_blur);
// now the new image becomes the previous image for the next step
$previmage = $nextimage;
$prevwidth = $nextwidth;
$prevheight = $nextheight;
}
// scale back to original size and blur one more time
imagecopyresized($gdimageresource, $nextimage,
0, 0, 0, 0, $originalwidth, $originalheight, $nextwidth, $nextheight);
imagefilter($gdimageresource, img_filter_gaussian_blur);
// clean up
imagedestroy($previmage);
// return result
return $gdimageresource;
}
private function image_create_from_ext($imgfile)
{
$info = getimagesize($imgfile);
$im = null;
switch ($info[2]) {
case 1: $im=imagecreatefromgif($imgfile); break;
case 2: $im=imagecreatefromjpeg($imgfile); break;
case 3: $im=imagecreatefrompng($imgfile); break;
}
return $im;
}
}
$image_blur = new image_blur();
$image_blur->gaussian_blur("./1.jpg",null,null,3);
?>
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以上就是php如何模糊图片案例的详细内容。