coding a loop in cake?

hi,

i need to check if a specific, randomly generated number already
exists in the database. when it does exist, a new number needs to be
created and checked too. until there is a number, that doesn't exist
already..

the check in my model for existance:

function validatenumber($data)
{
$test = $this->find(array('number' => $data), array('user_id'));

if(empty('test') == true)
return true;
return false;
}

now i can make a working check, but only once in my controller:

$x=rand(10,100000);

if($test=$this->Linkable->validatenumber($x) == true)
{
return $x:
}else{
....
}

but how can i make a loop to create numbers as long as one is not
already taken? is there sth like a for loop? havent seen anything like
that yet

thank you so much :)

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