JavaScript

var qty = $("#qty").val();

jQuery('.a-seats').click(function(){
    qty = $("#qty").val();
    qty--;
});

<script>
$(document).ready(function(){
    
	jQuery('.a-seats').click(function(){
    qty = $("#qty").val();
    qty--;
});
		
		if(qty == 0){			
			document.getElementById("a-seats").style.zIndex='-1';
		}
});
</script>

<script>
$(document).ready(function(){
    
	jQuery('.a-seats').click(function(){
    qty = $("#qty").val();
    qty--;
	});
		
		if(qty == 0){			
			document.getElementById("a-seats").style.zIndex='-1';
		}
	});
</script>


<?php
$db = mysqli_connect('localhost','root','','capstone');
$getallmsg = "SELECT * FROM reservation where seatColumn = 'A' ORDER BY Id DESC"; //ORDER BY seatId DESC
$result = $db->query($getallmsg);
echo '<div id="a-holder">';
while ($holder = $result->fetch_array(MYSQLI_ASSOC)) {
				
				$template = '<div class="a-seats" id="%s"></div>';
				$id= $holder['seatId'];	
				$reserved = $holder['reserved'];
				printf("$template  ",$id);
?>
	
<?php	
	}
	echo '</div>';
	/*free result set */
				$result->free();

				/* close connection */
				$db->close();
?>

<?php 
$qty = $_POST['qty'];
echo '<input type="hidden" id="qty" value="'.$qty.'">';
?>
<script>
$(document).ready(function(){
    qty = $("#qty").val();
	jQuery('.a-seats').click(function(){
		if(qty != 0){
		alert(qty);
			qty--;
		}else if(qty == 0){
			document.getElementByClass("a-seats").style.zIndex='-1';
		}
	})
});
</script>

<script>
		var timer = 0;
			$(document).ready(function() {	
					var from = $("#holder_from").val();
					var destination = $("#holder_to").val();
					var qty = $("#holder_qty").val()
				timer = setInterval(function() {	
					$.ajax({
						type : "POST",
						url : "select_seatmap.php",
						data : "from="+from+"&destination="+destination+"&qty="+qty,
						success : function(data) {
							$('#seatmap-wrapper').html(data);
						}
					});
				}, 500);
			})
		</script>

<script>
		var timer = 0;
			$(document).ready(function() {	
					var from = $("#holder_from").val();
					var destination = $("#holder_to").val();
					var qty = $("#holder_qty").val()
				timer = setInterval(function() {	
					$.ajax({
						type : "POST",
						url : "select_seatmap.php",
						data : "from="+from+"&destination="+destination+"&qty="+qty,
						success : function(data) {
							$('#seatmap-wrapper').html(data);
						}
					});
				}, 1000);
			})
		</script>

<?php 
$qty = $_POST['qty'];
echo '<input type="hidden" id="qty" value="'.$qty.'">';
?>
<script>
$(document).ready(function(){
   var qty = parseInt($("#qty").val());

	jQuery('.a-seats').click(function(){
		clearInterval(timer);
		if(qty != 0){
			qty--;
		}
		if(qty == 0){
			$('.a-seats').unbind();
			
		}
	})
});
</script>

var stringArray = new Array(3);

stringArray[x] = eval("string" + (x + 1));

stringArray

var stringArray = new Array(3);
  //Then in a for loop add each string to the array
 for(x=0; x<stringArray.length-1; x ++)
 {
  //Add string
    stringArray[x]= "string" + (x+1);
  }