1.PHP fsockopen函数说明：
Open Internet or Unix domain socket connection（打开套接字链接）
Initiates a socket connection to the resource specified by target .
fsockopen() returns a file pointer which may be used together with the other file functions (such as fgets() , fgetss() , fwrite() , fclose() , and feof() ).就是返回一个文件句柄
开启PHP fsockopen这个函数
PHP fsockopen需要 PHP.ini 中 allow_url_fopen 选项开启
$fp = fsockopen("www.example.com",
80, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />\n";
} else {
$out = "GET / HTTP/1.1\r\n";
$out .= "Host: www.example.com\r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
while (!feof($fp)) {
echo fgets($fp, 128);
}
fclose($fp);
}