获取文本中首张图片地址

/**
 * [getPic description]
 * 获取文本中首张图片地址
 * @param  [type] $content [description]
 * @return [type]          [description]
 */
  function getPic($content){
        if(preg_match_all("/(src)=([\"|']?)([^ \"'>]+\.(gif|jpg|jpeg|bmp|png))\\2/i", $content, $matches)) {
           $str=$matches[3][0];
       if (preg_match('/\/Uploads\/images/', $str)) {
           return $str1=substr($str,7);
       }
    }
}