socket 发送请求

socket方式：

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
//socket_set_option($socket, SOL_SOCKET, SO_SNDTIMEO, array("sec"=>20, "usec"=>0));
socket_connect($socket, ‘www.baidu.com‘, 80);

//里面的换行代表 \r\n 注意拷贝的代码后面可能有空格
$http = <<<eof
GET / HTTP/1.0
Accept: */*
User-Agent: Lowell-Agent
Host: www.baidu.com
Connection: Close

eof;

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

while($str = socket_read($socket, 1024))
{
    echo $str;
}

socket_close($socket);

fsockopen方式：

$fp = fsockopen("www.baidu.com", 80, $errno, $errstr, 30);

if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {
    $out = "GET / HTTP/1.1\r\n";
    $out .= "Host: www.baidu.com\r\n";
    $out .= "Connection: Close\r\n\r\n";
    fwrite($fp, $http);
    while (!feof($fp)) {
        echo fgets($fp, 128);
    }
    fclose($fp);
}

原始socket方式：

$fp = stream_socket_client("tcp://www.baidu.com:80", $errno, $errstr, 30);
if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {

    $http = <<<eof
GET / HTTP/1.0
Accept: */*
User-Agent: Lowell-Agent
Host: www.baidu.com
Connection: Close

eof;

    fwrite($fp, $http);
    while (!feof($fp)) {
        echo fgets($fp, 1024);
    }
    fclose($fp);
}