PHP의 이미지에서 가우시안 블러를 얻는 방법

<?php
class image_blur{
   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[&#39;basename&#39;];
    $path = $temp[&#39;dirname&#39;];
    $exte = $temp[&#39;extension&#39;];
    $savename = $savename ? $savename : $name;
    $savepath = $savepath ? $savepath : $path;
    $savefile = $savepath .&#39;/&#39;. $savename;
    $srcinfo = @getimagesize($srcImg);
    switch ($srcinfo[2]) {
      case1: imagegif($srcImgObj, $savefile); break;
      case2: imagejpeg($srcImgObj, $savefile); break;
      case3: imagepng($srcImgObj, $savefile); break;
      default: return&#39;保存失败&#39;; //保存失败
    }
    return $savefile;
    imagedestroy($srcImgObj);
  }
}
$image_blur = new image_blur();
//blurFactor的值代表模糊程度，savepath为空时候直接覆盖，savename为空直接用原名
$image_blur->gaussian_blur($srcImg="./5.jpg",$savepath=null,$savename=null,$blurFactor=5);
?>