php fsockopen伪造post与get方法的详解

<?php
//fsocket模拟post提交
$purl = "http://localhost/netphp/test2.php?uu=rrrrrrrrrrrr";
print_r(parse_url($url));
sock_post($purl,"uu=55555555555555555");
//fsocket模拟get提交
function sock_get($url, $query)
{
   $info = parse_url($url);
   $fp = fsockopen($info["host"], 80, $errno, $errstr, 3);
   $head = "get ".$info['path']."?".$info["query"]." http/1.0rn";
   $head .= "host: ".$info['host']."rn";
   $head .= "rn";
   $write = fputs($fp, $head);
   while (!feof($fp))
   {
    $line = fread($fp,4096);
    echo $line;
   }
}
sock_post($purl,"uu=rrrrrrrrrrrrrrrr");
function sock_post($url, $query)
{
   $info = parse_url($url);
   $fp = fsockopen($info["host"], 80, $errno, $errstr, 3);
   $head = "post ".$info['path']."?".$info["query"]." http/1.0rn";
   $head .= "host: ".$info['host']."rn";
   $head .= "referer: http://".$info['host'].$info['path']."rn";
   $head .= "content-type: application/x-www-form-urlencodedrn";
   $head .= "content-length: ".strlen(trim($query))."rn";
   $head .= "rn";
   $head .= trim($query);
   $write = fputs($fp, $head);
   while (!feof($fp))
   {
    $line = fread($fp,4096);
    echo $line;
   }
}
?>