1.将jsonp数据转json格式

2.json检查数据的编码格式是否跟php一样，否则json_decode会失败

	
	public function jsonp_decode($jsonp, $assoc = false)
	{
		$jsonp = trim($jsonp);

		if(isset($jsonp[0]) && $jsonp[0] !== '[' && $jsonp[0] !== '{') {
			$begin = strpos($jsonp, '(');

			if($begin)
			{
				$end = strrpos($jsonp, ')');
				if($end)
				{
					$jsonp = substr($jsonp, $begin + 1, $end - $begin - 1);
				}
			}
		}
        $encode = mb_detect_encoding($jsonp, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'));
        if ($encode !== "UTF-8"){
            $jsonp = iconv($encode,"UTF-8",$jsonp);
        }
		return json_decode($jsonp,$assoc);
	}