php通過socket套接字擷取web伺服器的響應内容

<?php

$url="www.baidu.com";  //域名

$path="/";  //路徑

$type="GET"; //請求方法

error_reporting(E_ALL);

echo "<h2>TCP/IP Connection</h2>\n";

$service_port = getservbyname('www', 'tcp');

$address = gethostbyname($url);

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

if ($socket === false) {

    echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";

} else {

    echo "OK.\n";

}

echo "Attempting to connect to '$address' on port '$service_port'...";

$result = socket_connect($socket, $address, $service_port);

if ($result === false) {

    echo "socket_connect() failed.\nReason: ($result) " . socket_strerror(socket_last_error($socket)) . "\n";

} else {

    echo "OK.\n";

}

$in = $type." ".$path." HTTP/1.1\r\n";

$in .= "Host: ".$url."\r\n";

$in .= "Connection: Close\r\n\r\n";

$out = '';

echo "Sending HTTP HEAD request...";

socket_write($socket, $in, strlen($in));

echo "OK.\n";

echo "Reading response:\n\n";

while ($out = socket_read($socket, 2048)) {

    echo $out;

}

echo "Closing socket...";

socket_close($socket);

echo "OK.\n\n";

?>