この機能が何を意味するのか説明していただけますか?何をするか

function uc_fopen($url, $limit = 0, $post = '', $cookie = '', $bysocket = FALSE, $ip = '', $timeout = 15, $block = TRUE) {<br>
	$return = '';<br>
	$matches = parse_url($url);<br>
	!isset($matches['host']) && $matches['host'] = '';<br>
	!isset($matches['path']) && $matches['path'] = '';<br>
	!isset($matches['query']) && $matches['query'] = '';<br>
	!isset($matches['port']) && $matches['port'] = '';<br>
	$host = $matches['host'];<br>
	$path = $matches['path'] ? $matches['path'].($matches['query'] ? '?'.$matches['query'] : '') : '/';<br>
	$port = !empty($matches['port']) ? $matches['ポート'] : 80;<br>
	if($post) {<br>
		$out = "POST $path HTTP/1.0rn";<br>
		$out .= "受け入れる: */*rn";<br>
		//$out .= "リファラー: $boardurlrn";<br>
		$out .= "Accept-Language: zh-cnrn";<br>
		$out .= "Content-Type: application/x-www-form-urlencodedrn";<br>
		$out .= "ユーザーエージェント: $_SERVER[HTTP_USER_AGENT]rn";<br>
		$out .= "ホスト: $hostrn";<br>
		$out .= 'Content-Length: '.strlen($post)."rn";<br>
		$out .= "接続: 閉じる";<br>
		$out .= "キャッシュ制御: キャッシュなし";<br>
		$out .= "Cookie: $cookiernrn";<br>
		$out .= $post;<br>
	} else {<br>
		$out = "GET $path HTTP/1.0rn";<br>
		$out .= "受け入れる: */*rn";<br>
		//$out .= "リファラー: $boardurlrn";<br>
		$out .= "Accept-Language: zh-cnrn";<br>
		$out .= "ユーザーエージェント: $_SERVER[HTTP_USER_AGENT]rn";<br>
		$out .= "ホスト: $hostrn";<br>
		$out .= "接続: 閉じる";<br>
		$out .= "Cookie: $cookiernrn";<br>
	}<br>
	if(function_exists('fsockopen')) {<br>
		$fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);<br>
	} elseif (function_exists('pfsockopen')) {<br>
		$fp = @pfsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);<br>
	} else {<br>
		$fp = false;<br>
	}<br>
<br>
	if(!$fp) {<br>
		戻る '';<br>
	} else {<br>
		stream_set_blocking($fp, $block);// 让程序障害なし<br>
		stream_set_timeout($fp, $timeout);<br>
		@fwrite($fp, $out);<br>
		$status = stream_get_meta_data($fp);// 读取流時の時間制御に作用します<br>
		if(!$status['timed_out']) {<br>
			while (!feof($fp)) {<br>
				if(($header = @fgets($fp)) && ($header == "rn" || $header == "n")) { <div class="clear"></div>