How to modify an array


      $names = array('Mike', 'Mike', 'Mike', 'Anne', 'Joel', 'Joel');
      $names = array_unique($names); // Mike, Anne, Joel
      $names = array_reverse($names); // Joel, Anne, Mike
      shuffle($names); // Mike, Joel, Anne (for example)

How to modify an associative array


      $tax_rates = array('NC' => 7.75, 'NY' => 8.875, 'CA' => 8.25);

      $tax_rates = array_reverse($tax_rates, true);

How to get random keys from an array


      $names = array('Mike', 'Anne', 'Joel', 'Ray', 'Pren');

      $key = array_rand($names); // 2 (for example)

      $names_rand = array_rand($names, 3); // 0, 1, 3 (for exmple)

How to shuffle and deal a deck of cards


      // Create the deck of cards 

      $faces = array('2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K', 'A');
 $suits = array('h', 'd', 'c', 's');

      $cards = array();

      foreach($faces as $face) {

          foreach($suits as $suit) {

            $cards[] = $face . $suit; 

          }

      }

      // Shuffle the deck and deal the cards

      shuffle($cards);

      $hand = array();

      for ($i = 0; $i < 5; $i++) {

        $hand[] = array_pop($cards);

      }

      echo implode(',', $hand); // 9c,6d,Ks,4c,7h (for example)

Hand = " . implode(',', $hand) . "

\n"); // 9c,6d,Ks,4c,7h (for example) ?>