View difference between Paste ID: 0265hdYD and TC45zaRQ

 <?php
 
 class SerialGenerator
 {
     public function generate()
     {
         $serial = array();
         $key = array_merge(
             range('a', 'z'),
             range(0, 9)
         );
 
         do {
             $serial[] = $key[array_rand($key, 1)];
         } while (count($serial) < 12);
 
         return implode('', $serial);
     }
 
     public function start($amount = 100)
     {
         $results = array();
 
         for ($i = 0; $i < $amount; $i++) {
             $gen = $this->generate();
 
             do {
                 $gen = $this->generate();
                 srand(microtime() * 10000000);
             } while (in_array($gen, $results) === true);
 
             $results[] = $gen;
 
             var_dump("{$i} " . $this->colorize($gen));
         }
     }
 
     public function colorize($text, $status = 'SUCCESS') {
         $out = '';
 
         switch($status) {
             case 'SUCCESS':
                 $out = '[42m'; //Green background
                 break;
             case 'FAILURE':
                 $out = '[41m'; //Red background
                 break;
             case 'WARNING':
                 $out = '[43m'; //Yellow background
                 break;
             case 'NOTE':
                 $out = '[44m'; //Blue background
                 break;
         }
 
         return chr(27) . "$out" . "$text" . chr(27) . "[0m";
     }
 }