function request_by_curl($url, $post_data = '', $timeout = 30) {
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	//post提交，否则get
	if ($post_data != '') {
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
	}
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
	curl_setopt($ch, CURLOPT_HEADER, false);
	//跳过SSL验证
	curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, '0');
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, '0');
	$file_contents = curl_exec($ch);
	curl_close($ch);
	return $file_contents;
}

//$result存储返回的数据
//post
$result = request_by_curl('http://www.hadsky.com', 'username=hadsky&password=hadsky.com');
//get
$result = request_by_curl('http://www.hadsky.com');