Edit a default array() with a hook

[Logikos]

Okay, how would I go about doing this?

PHP Code:

$var = array(
        'blah1' => $vbphrase['blah1'],
        'blah1' => $vbphrase['blah1']
);

($hook = vBulletinHook::fetch_hook('some_hook')) ? eval($hook) : false; 


Thats the code in the file. How would I add

PHP Code:

'blah3' => $vbphrase['blah3'] 


With that hook sitting right underneath? I'm finishing a tutorial for vB.org, and I need to figure that out to finish it. Kirby come help!!!

Thanks!