if() function inside the array() function

I would like to do something like that:

 array(

if($condition = "xyz") { array('value' => $a, 'text' => $a), }
                         array('value' => $b, 'text' => $b),
                         ...
);

but it would not allow me to have that if function inside that array function? What I am doing wrong? Is there a way to make it possible? Thanks in advance!