check value in $_POST variable

[eluser][email protected][/eluser]
I want to some idea to make code simplifly more than this
In the controller I have a code
if($this->input->post('name')!='')
{
$data = array(
'name' => $this->input->post('name'),
'number' => $this->session->userdata('number')
);
}
if($this->input->post('number')!='')
{
$data = array(
'name' => $this->session->userdata('name'),
'number' => $this->input->post('number'),

);
}
.....
when I have many index in array $_POST I must write if function more and more
Can anyone tell me to make code simplifly more than that to check entry value may by interation or anything I have a loose.
Thank you