PHP伪造页面referer来源地址几种方法

$opt=array('http'=>array('header'=>"Referer: $refer"));
$context=stream_context_create($opt);
$file_contents = file_get_contents($url,false, $context);

$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, "http://www.111com.net");
curl_setopt ($ch, CURLOPT_REFERER, "http://www.111com.net/");
curl_exec ($ch);
curl_close ($ch);

$server = 'www.111com.net';
$host = 'www.111com.net';
$target = 'index.php';
$referer = 'http://www.111com.net/'; // Referer
$port = 80;
$fp = fsockopen($server, $port, $errno, $errstr, 30);
if (!$fp){
  echo "$errstr ($errno)＼n";
}else{
$out = "GET $target HTTP/1.1＼r＼n";
$out .= "Host: $host＼r＼n";
$out .= "Referer: $referer＼r＼n";
$out .= "Connection: Close＼r＼n＼r＼n";
fwrite($fp, $out);
while (!feof($fp)){
echo fgets($fp, 128);
}
fclose($fp);
}

echo "