PHP array keys in a constant -

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i have quick question. have placed array in constant when add array keys craps out. code below.

<?php define("my_const_arr", serialize(array("page_ids" => array("1234", "4123")))); ?>  <?php $page_id = "4123"; ?>  <?php if(in_array($page_id, unserialize(my_const_arr["page_ids"]))): ?> <h1>hello stackoverflow</h1> <?php endif; ?>

you can't my_const_arr["page_ids"] @ point because it's still string. should unserialize first , access 

$arr = unserialize(my_const_arr); if(in_array($page_id, $arr["page_ids"])):

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