Generate Keys with Delimiter characters to whatever you want or let it figure that out for you! With this you get the Key back with the hash for the key to store in your database!

createKey.php

<?php

/**
 * Create Key Function
 * Generate a Key that you need with a specific length and a split character.
 *
 * @param Int           Length of the Key, Total Length
 * @param Int|Boolean   If False, Disabled (default) and the int will provide the spacing for the char.
 * @param Char|String   The Separation Character for the Key every x characters.
 * @return Array        Return of 'key' and 'hash' and 'hash_delimiter'
 *    You can use 'hash' from the output to store in the database.
 *    You will get 2 Hashes:
 *      'hash'              The Text Hash of the key
 *      'hash_delimiter'    The Text Hash that has $splitChar every $splitLoc
 */
function createKey($len = 5, $splitLoc = false, $splitChar = "-") {
    // If Split Location Set True (Auto Locaiton)
    if($splitLoc === true){
      $step = range(12, 0);
      foreach($step as $k => $v){
        if( $len%$v == 0 ){
          $splitLoc = $v;
          break;
        }
      }
    }

    $chars = "23456789ABCDEFGHJKLMNPRSTUVWXYZ";
    $i = 0;
    $roll = $splitLoc;
    $pass = "";
    $pasd = ""; // Has $splitChar

    // Shuffle the Characters' order
    $chars = str_split($chars);
    shuffle($chars);
    shuffle($chars);
    $chars = implode($chars);

    // Generate the Key
    while ($i < $len) {
      if($splitLoc !== false && $roll == $i) {
        // Insert the Split Character
      	$roll = $roll+$splitLoc;
      	$pasd .= $splitChar;
      }

      $num = rand() % (strlen($chars)-1);
      $c = substr($chars, $num, 1);
      $pass .= $c;
      $pasd .= $c;
      $i++;
    }

    return array('key' => $pasd, 'plain' => $pass, 'hash' => hash('sha256', $pass), 'hash_delimiter' => hash('sha256', $pasd));
}

print_r(createKey(25, 5));
echo "<br><br>";
print_r(createKey(128, true));
echo "<br><br>";
print_r(createKey(128));

?>