Using curl and fopen

curlFopen.php

<?php
/*
go=1 (hidden)
hp='value from textbox'
message='value from texarea'
c='captcha image'
*/

/**Data generation**/
$vars = array(
    'go' => '1',
    'hp' => '4422332211',
    'message' => 'lllllllllll',
    'c' => 'VBNM'
);
$data = http_build_query($vars);

/***CURL uses***/
$ch = curl_init();
 
curl_setopt( $ch, CURLOPT_HEADER, 1);
curl_setopt( $ch, CURLINFO_HEADER_OUT, 1);
curl_setopt( $ch, CURLOPT_AUTOREFERER, 1);
curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt( $ch, CURLOPT_COOKIEJAR, $ckfile);
curl_setopt( $ch, CURLOPT_POST, 1);
curl_setopt( $ch, CURLOPT_COOKIEFILE, $ckfile); 
curl_setopt( $ch, CURLOPT_REFERER, $url);
curl_setopt( $ch, CURLOPT_POSTFIELDS, $data);
curl_setopt( $ch, CURLOPT_HTTPHEADER, array('Keep-Alive: 115',  'Connection: keep-alive',  'Content-type: application/x-www-form-urlencoded', 'Content-length: '.strlen($to_post_field)));
curl_setopt( $ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1');
curl_setopt( $ch, CURLOPT_URL, $url);
$store = curl_exec($ch);


/***Fopen uses***/
fwrite($fp, "POST /index.php HTTP/1.1\r\n");
fwrite($fp, "Host: www.example.com\r\n");
fwrite($fp, "Content-Type: application/x-www-form-urlencoded\r\n");
fwrite($fp, "Content-Length: ".strlen($data)."\r\n");
fwrite($fp, "Cookie: PHPSESSID=".$sid."\r\n");
fwrite($fp, "Connection: close\r\n");
fwrite($fp, "\r\n");
 
fwrite($fp, $data);
 
header('Content-type: text/plain');
while (!feof($fp)) {
    echo fgets($fp, 1024);
}