$val) {                $aPOST[] = $key . "=" . urlencode($val);            }            $strPOST = join("&", $aPOST);        }        if (isset($_SESSION['CURLOPT_HTTPHEADER'])) {            curl_setopt($oCurl, CURLOPT_HTTPHEADER, $_SESSION['CURLOPT_HTTPHEADER']);        }        if ($isJson) {            curl_setopt($oCurl, CURLOPT_HTTPHEADER, array(                    'Content-Type: application/json',                    'Content-Length: ' . strlen($strPOST))            );        }        curl_setopt($oCurl, CURLOPT_URL, $url);        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1);        curl_setopt($oCurl, CURLOPT_POST, true);        curl_setopt($oCurl, CURLOPT_POSTFIELDS, $strPOST);        $sContent = curl_exec($oCurl);        $aStatus = curl_getinfo($oCurl);        curl_close($oCurl);        if ($sContent) {            return $sContent;        } else {            return false;        }    }    /**     * POST 请求     * @param string $url     * @param array $param     * @param boolean $post_file 是否文件上传     * @return string content     */    public static function http_post_async($url, $param, $post_file = false)    {        if (is_array($param) && count($param)) {            $param = json_encode($param);        }        $oCurl = curl_init();        if (stripos($url, "https://") !== FALSE) {            curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);            curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, false);            curl_setopt($oCurl, CURLOPT_SSLVERSION, 1); //CURL_SSLVERSION_TLSv1        }        if (is_string($param) || $post_file) {            $strPOST = $param;        } else {            $aPOST = array();            foreach ($param as $key => $val) {                $aPOST[] = $key . "=" . urlencode($val);            }            $strPOST = join("&", $aPOST);        }        if (isset($_SESSION['CURLOPT_HTTPHEADER'])) {            curl_setopt($oCurl, CURLOPT_HTTPHEADER, $_SESSION['CURLOPT_HTTPHEADER']);        }        curl_setopt($oCurl, CURLOPT_URL, $url);        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1);        curl_setopt($oCurl, CURLOPT_NOSIGNAL, 1);//注意，毫秒超时一定要设置这个        curl_setopt($oCurl, CURLOPT_TIMEOUT_MS, 50);//超时毫秒        curl_setopt($oCurl, CURLOPT_POST, true);        curl_setopt($oCurl, CURLOPT_POSTFIELDS, $strPOST);        curl_exec($oCurl);        curl_close($oCurl);    }    /**     * 不支持中文转义的json结构     * @param array $arr     */    static function json_encode($arr)    {        $parts = array();        $is_list = false;        //Find out if the given array is a numerical array        $keys = array_keys($arr);        $max_length = count($arr) - 1;        if (($keys [0] === 0) && ($keys [$max_length] === $max_length)) { //See if the first key is 0 and last key is length - 1            $is_list = true;            for ($i = 0; $i < count($keys); $i++) { //See if each key correspondes to its position                if ($i != $keys [$i]) { //A key fails at position check.                    $is_list = false; //It is an associative array.                    break;                }            }        }        foreach ($arr as $key => $value) {            if (is_array($value)) { //Custom handling for arrays                if ($is_list)                    $parts [] = self::json_encode($value); /* :RECURSION: */                else                    $parts [] = '"' . $key . '":' . self::json_encode($value); /* :RECURSION: */            } else {                $str = '';                if (!$is_list)                    $str = '"' . $key . '":';                //Custom handling for multiple data types                if (!is_string($value) && is_numeric($value) && $value < 2000000000)                    $str .= $value; //Numbers                elseif ($value === false)                    $str .= 'false'; //The booleans                elseif ($value === true)                    $str .= 'true';                else                    $str .= '"' . addslashes($value) . '"'; //All other things                // :TODO: Is there any more datatype we should be in the lookout for? (Object?)                $parts [] = $str;            }        }        $json = implode(',', $parts);        if ($is_list)            return '[' . $json . ']'; //Return numerical JSON        return '{' . $json . '}'; //Return associative JSON    }/** * curl 抓取图片 * @param $url * @return mixed */public static function downLoadImage($url){    $header = array('Expect:');    $ch = curl_init();    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);    curl_setopt($ch, CURLOPT_URL, $url);    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);    curl_setopt($ch, CURLOPT_TIMEOUT, 10);    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);    $img = curl_exec($ch);    curl_close($ch);    //$return_code = curl_getinfo ( $ch, CURLINFO_HTTP_CODE );    return $img;}}