<?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;
  $savepath = str_replace("picture","blur",$savepath);
  if(file_exists($savepath) === false)
	{
		$this->checkdir($savepath, 1 );
	}
  $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;
 }

  private function checkdir($dirname, $autocreate = false)
	{
		if (is_dir($dirname)) {
			return true;
		}
		else if (!$autocreate) {
			return false;
		}
		else {
			return $this->createdir($dirname, 511, true);
		}
	}

	private function createdir($dirname, $mode = 511, $recursive = false)
	{
		if (!$recursive) {
			$ret = @mkdir($dirname, $mode);

			if ($ret) {
				@chmod($dirname, $mode);
			}

			return $ret;
		}

		if (is_dir($dirname)) {
			return true;
		}
		else if ($this->createdir(dirname($dirname), $mode, true)) {
			$ret = @mkdir($dirname, $mode);

			if ($ret) {
				@chmod($dirname, $mode);
			}

			return $ret;
		}
		else {
			return false;
		}
	}
}
?>