<?php $slotname = 'div-gpt-ad-1537308433594-0'. $alm_item .''; // Generate unique ID for the ad slot ?>
<div id='<?php echo $slotname; ?>'></div>
<script>
    googletag.cmd.push(function() {
    var slot = googletag.defineSlot('/168615172/GT_EU_728x90', [[728, 90], [300, 60]], '<?php echo $slotname; ?>').
        setTargeting('pos', ['1']).
        addService(googletag.pubads());
        // Display has to be called before
        // refresh and after the slot div is in the page.
        googletag.display('<?php echo $slotname; ?>');
        googletag.pubads().refresh([slot]);
    });
</script>