the local variable marker _$tag is never read

the local variable marker _$tag is never read

Hello every on i m beginner in php and javascript ,so i m try to load data
from mysql data base to create a dynamic markers ;but a warning in eclipse
that show's the local variable marker _$tag is never read here is the line
that contains warning :
var marker_<?php echo ($marker['NUM']);?> = new
google.maps.Marker({position: myLatlng,
map: map,
title: <?php echo $marker['NOM']; ?>,
icon: image
});
`
cause i want to create marker name var like marker_id .please help me