plz help with explode.

i have a text file that contant user name n pass in this format.

user111111,pass
1111111111,1111
2222222222,2222
3333333333,3333
4444444444,4444
5555555555,5555
6666666666,6666
7777777777,7777
8888888888,8888
9999999999,9999

(or suggest  me beter format for post data frm text file)

and i have this curl that working with "while" loop

$i = 0;
while($i != 50) {
  // Your code here
  $i++;
}

<?php

$username ="8888888";
$password ="2417978";
$tomob ="888888888";
$myFile22 = "xxxxxx.txt";
$fh2 = fopen($myFile22, 'r');
$theData22 = fread($fh2, filesize($myFile22));
fclose($fh2);


$raman = explode(';',$theData22);


      function randomstring() {
      $characters = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
      $param=rand(5,strlen($characters) - 1);
      $random_string_length = $param;
      $string = '';
        for ($i = 0; $i < $random_string_length; $i++) {
      $string .= $characters[rand(0, strlen($characters) - 1)];
      }
        return ($string);
   }

$i = 0;
while($i != 9) {

$c = $_REQUEST['recaptcha_challenge_field'];
$cv = $_REQUEST['recaptcha_response_field'];
$cookie = tempnam("/tmp", "CURLCOOKIE");

$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,"http://example.com");
curl_setopt($ch,CURLOPT_COOKIEJAR,$cookie);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch,CURLOPT_REFERER,"http://example.com");
$one=curl_exec($ch);

preg_match("/input name=\"(.*?)\" type=\"text\" class=\"existing_user round_four\" id=/i",$one,$matches);
$user = $matches[1];

preg_match("/input name=\"(.*?)\" type=\"password\" class=\"existing_user round_four\" id=/i",$one,$matches);
$pass = $matches[1];

$post_data = "$user=$username&$pass=$password&RememberMe=1&submit2=LOGIN HERE";
$url = "http://example.com";
$cookie = tempnam ("/tmp", "CURLCOOKIE");
$ch = curl_init();
curl_setopt( $ch, CURLOPT_USERAGENT,"User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0" );
curl_setopt( $ch, CURLOPT_URL, $url );
curl_setopt ($ch, CURLOPT_HTTPHEADER, Array("Content-Type: application/x-www-form-urlencoded","Accept: */*"));
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
curl_setopt( $ch, CURLOPT_COOKIEJAR, $cookie );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
$ct = curl_exec( $ch );

if(stristr($ct,"number & password"))


{
echo "<font color='red'><b>Invalid mobile number / password. Try Again With Correct Details.</b></font>";
}
else
{

if(stristr($ct,"xxxxx.php"))
{

{
echo "<b><font color=red>ccccccccccccccccccc.</font></b><br>";
}
$i++;
}

?>

so here what i want.

first explode username and pass frm text file then intrigret  with whil loop  for post data @ $username ="8888888";
                                                                                                                                           $password ="2417978";

so can u help me with a example how to do that multi user login with 1 script.

.