function getUniqueFrontendNam frontend this- find list array condition

function getUniqueFrontendName( $frontend ) {
    $f = $this->find('list', array(
        'conditions'=>array( 'frontend LIKE'=>"$frontend%" ),
        'fields'=>array( 'frontend' )
    ));
    if ($f) {
        $lastNum = 0;
        $frontend = $frontend.$lastNum;
        while ( in_array($frontend, $f) ){
            $lastNum++;
            $frontend = substr($frontend, 0, - strlen($lastNum) ).$lastNum;
        }
    }
    return $frontend;
}