php请求url的方法小结

$file = fopen("http://www.php.cn/", "r") or die("打开远程文件失败!");
while (!feof($file)) {
 $line = fgets($file, 1024);
 //使用正则匹配标题标记
 if (preg_match("/<title>(.*)<\/title>/i", $line, $out)) { 
 $title = $out[1]; //将标题标记中的标题字符取出
 break; //退出循环，结束远程文件读取
 }
}
fclose($file);

$lines = file("http://www.php.cn/php-weizijiaocheng-386441.html");
readfile(http://www.php.cn/php-weizijiaocheng-386441.html);

$content = file_get_contents(http://www.php.cn/php-weizijiaocheng-386441.html);

$url = "http://www.php.cn/";
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$contents = curl_exec($ch);
curl_close($ch);

//exec("wget 220.181.111.188");
shell_exec("wget 220.181.111.188");