API key for multiple domain script, google map V2

Question

could any one check why my script below is not working please?

<script src="http://maps.google.com/maps?file=api&amp;amp;v=2.x&amp;amp;key=
<?php  
$this->googleMapsApiKey = $this->getValueFromDB("google", "googleMapsApiKey");
            if ($_SERVER['HTTP_HOST']=='www.ABC.info') { 
        $this->googleMapsApiKey = "Googlemap-keys";
            } elseif ($_SERVER['HTTP_HOST']=='www.CBA.com') { 
        $this->googleMapsApiKey = "Googlemap-keys";
        } 
?>" type="text/javascript"></script>

Thanks a lot!!