Pastebin Database Scraper

<?php
##########################################################
#PasteBin Scraping By H4T3D
#Some User Searched >> http://pastebin.com/LRRQ4vnK
###########################################################

 function randon(){

//dRJ5DkUh
    $length = 8;
         $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString."\n";

}

    set_time_limit(0);
       // error_reporting(0);
        echo "<title>PasteBin Scraping By H4T3D</title>
<link href='https://fonts.googleapis.com/css?family=Orbitron' rel='stylesheet' type='text/css'>
<style type=\"text/css\">
    body,b,input,a {
        background-color: #f0f0f2;
        margin: 0;
        padding: 0;
         font-family: 'Orbitron', sans-serif;

    }
textarea,input {
       resize:none;
       color: #4099FF ;
       border: 4px solid #3B5998;


}
</style>
  <form method='POST'>
  <center>
       <font face='Tahoma' size='5'><b>PasteBin Scraping By H4T3D</b></font><br>
  <br></br>Enter Permutation Numbers : <input type='text' name='list' /><br>
   <br></br><input type='submit' name='start' value='Check Available Pastebins'><br></br><a href='pastebindirectory.txt'> >> Pastebin User Directory Found</a></br>

  </center></form>";

        if(isset($_POST['start']))
        {
            $list = $_POST['list'];

          for($i = 0 ; $i < $list ; $i++)
            {
                         $users = randon();


                        $headers = @get_headers("http://pastebin.com/".$users);
                       // echo $headers[0];

                        if(strpos($headers[0],'404') === false)
                        {
                        print "<font face='Tahoma' size='2' color='green'>Avaliable -> $users <font face='Tahoma' size='2' ><a href='http://pastebin.com/".$users."'>http://pastebin.com/$users</a></font></font><br>";
                             $myfile = fopen("pastebindirectory.txt", "a") or die("Unable to open file!");
                             fwrite($myfile,"http://pastebin.com/".$users);
                             fwrite($myfile,"\n");
                             fclose($myfile);
                        flush();@ob_flush();
                               } else {
                                print "<font face='Tahoma' size='2'  color='red' >Not Avaliable -> <font face='Tahoma' size='2'><b>".$users."</b></font></font><br>";
                        flush();@ob_flush();
                }

        }
        }
?>