file_get_contents无法请求https连接的解决方法_PHP教程

function http_request($url,$timeout=30,$header=array()){
        if (!function_exists('curl_init')) {
            throw new Exception('server not install curl');
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        if (!empty($header)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
        }
        $data = curl_exec($ch);
        list($header, $data) = explode("rnrn", $data);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($http_code == 301 || $http_code == 302) {
            $matches = array();
            preg_match('/Location:(.*?)n/', $header, $matches);
            $url = trim(array_pop($matches));
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_HEADER, false);
            $data = curl_exec($ch);
        }

        if ($data == false) {
            curl_close($ch);
        }
        @curl_close($ch);
        return $data;
}