Something

<form name='query_form' action='add_new_query.php' method=post>

	<select name='member_ids[]' size=7 multiple>
		<option name=one value=one> one </option>
		<option name=two value=two> two </option>
		<option name=three value=three> three </option>
		<option name=four value=four> four </option>
	</select>


<input type=submit>

</form>


//**********action page***********************


<?php

	print_r ($_POST['member_ids[]']);

?>