file_get_contentsでPOSTデータ送信

	private function __post_ file_get_contents()
	{
		$url = 'http://qiita.com/';

		// POSTデータ
		$data = array(
			"param1" => "1",
			"param2" => 2
		);
		$data = http_build_query($data, "", "&");

		// header
		$header = array(
			"Content-Type: application/x-www-form-urlencoded",
			"Content-Length: ".strlen($data)
		);

		$context = array(
			"http" => array(
				"method"  => "POST",
				"header"  => implode("\r\n", $header),
				"content" => $data
			)
		);

		$html = file_get_contents($url, false, stream_context_create($context));

		return html;
	}