Valeur d'une fonction retournée nulle

function creatoken () {
 $characts = 'abcdefghijklmnopqrstuvwxyz';
 $characts .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 $characts .= '1234567890';
 $numbadge = '';
 for($a=1;$a <= 14;$a++) {
  $numbadge .= $characts[ rand() % strlen($characts) ];
 }
 return $numbadge;
}

$token=creatoken();
echo"<p>token=$numbadge</p>";

$numbadge

$token=creatoken();
echo"<p>token=$token</p>";

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