PHP检验URL是否正确

实际上是毫无作用的函数了~因为现在的域名商都很滑。很多域名只要注册了，就算不使用也会被默认指向一个域名商的网址。所以即便探过去，都会返回一个200值。 = = 这也是没办法的事。

<?php
$url = 'http://www.example.com';

print_r(get_headers($url));

print_r(get_headers($url, 1));
?>

Array
(
    [0] => HTTP/1.1 200 OK
    [1] => Date: Sat, 29 May 2004 12:28:13 GMT
    [2] => Server: Apache/1.3.27 (Unix)  (Red-Hat/Linux)
    [3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT
    [4] => ETag: "3f80f-1b6-3e1cb03b"
    [5] => Accept-Ranges: bytes
    [6] => Content-Length: 438
    [7] => Connection: close
    [8] => Content-Type: text/html
)

Array
(
    [0] => HTTP/1.1 200 OK
    [Date] => Sat, 29 May 2004 12:28:14 GMT
    [Server] => Apache/1.3.27 (Unix)  (Red-Hat/Linux)
    [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
    [ETag] => "3f80f-1b6-3e1cb03b"
    [Accept-Ranges] => bytes
    [Content-Length] => 438
    [Connection] => close
    [Content-Type] => text/html
)

<?php
//$fp = file_get_contents("http://www.163.com");

$fp = fsockopen("www.selangsfer32.com", 80, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />/n";
exit;
}
?>