converting array to string

i am displaying modules and their parts according to modules on the same pahe.

$module=$this->Module->find('all', array('conditions'=> array('isactive'=>'0')));

$this->set('module',$module);

i need another find condition so i can compare that part is related to module and display accordingly :

$order = 'index ASC';
$conditions=array('moduleid'=>$module,'isactive'=>'1');
$modulepart=$this->Modulepart->find('all',array('order',$order,'conditions'=>array($conditions)));
$this->set ('modulepart',$modulepart);

i am getting this error so:

Notice (8): Array to string conversion

i understand that my $module is storing in array format ,so how do i strore in string format ???

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