php 'exit' problem with div layers?

[Protein]

I have a php function in a div layer (mid region) when php uses exit function, the layer beneath it (footer region) is not displayed.


<div id="header">
head
</div>

<div id="mid">
<?php
if (statement) {
exit;
}
?>
</div>

---Div layer below is not displayed after exit;---

<div id="footer">
footer
</div>

what do i do?