PHP curl函数制 exec_ch和get_headers

昨日，在项目中，有人在判断Youtube下的某个视频是否能够播放，写下了如下的代码：
 　　　　　　$request_url = ‘http://youtube.com/get_video_info?video_id=‘ . $vid . ‘&el=vevo&fmt=18&asv=2&hd=1‘;
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $request_url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, True);
            $data = curl_exec($ch);
            curl_close($ch);
            unset($ch);
            if ($data === false) {
                $this->deleteVideo($video[‘id‘]);
                echo "节目: " . $vid . " 节目id" . $video[‘id‘] . "无效,删除.\n";
                continue;
            }
            parse_str($data, $details);
            unset($data);
            if (!isset($details[‘url_encoded_fmt_stream_map‘]) || empty($details[‘url_encoded_fmt_stream_map‘])) {
                $this->deleteVideo($video[‘id‘]);
                echo "节目: " . $vid . " 节目id" . $video[‘id‘] . "无效,删除.\n";
                continue;
            }
            $newstr = explode(",", $details[‘url_encoded_fmt_stream_map‘]);
            $str1 = explode("&", $newstr[0]);
            $obj = array();
            for ($j = 0; $j < count($str1); $j++) {
                $str2 = explode("=", $str1[$j]);
                if (!isset($obj[$str2[0]])) {
                    $obj[$str2[0]] = $str2[1];
                }
            }
            $ary_re[‘source_url‘] = urldecode($obj[‘url‘]);
            if (empty($ary_re[‘source_url‘]) || !isset($ary_re[‘source_url‘])) {
                $this->deleteVideo($video[‘id‘]);
                echo "节目: " . $vid . " 节目id" . $video[‘id‘] . "无效,删除.\n";
                continue;
            } else {
                $bool = $this->getMobileCurl($ary_re[‘source_url‘]);  //不能够播放
                if ($bool === false) {
                    $this->deleteVideo($video[‘id‘]);
                    echo "节目: " . $vid . " 节目id" . $video[‘id‘] . "无效,删除.\n";
                    continue;
                }
            }
            $right_nums++;

　　　　　　　$ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $request_url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, True);
            $data = curl_exec($ch);
            curl_close($ch);
            unset($ch);
            if ($data === false) {
                return false 
            }

function getMobileCurl($url)
    {
        $res = get_headers($url, 1);
        $response_status = $res[0];
        if (strpos($response_status, "200") !== false || strpos($response_status, "302") !== false || strpos($response_status, "301") !== false) {
            return true;
        } else {
            return false;
        }
    }