php + Ajax การส่งค่าตัวแปรที่เป็นในลักษณะแบบ Array

function CreateObj(){
	HttPRequest   = false;
	if (window.ActiveXObject) {
		try {
			HttPRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
		try {
			HttPRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	} 
	if (!HttPRequest) {
		if (window.XMLHttpRequest) {
			HttPRequest = new XMLHttpRequest();
			if (HttPRequest.overrideMimeType) {
				HttPRequest.overrideMimeType('text/html');
			}	
		}
		if (!HttPRequest) {
			alert('Cannot create XMLHTTP instance');
			return false;
			}
	}
	return HttPRequest;
}

function fncPageData()
{
	var CountData = document.getElementById("txtcountLabelItem").value;
	var temp_id   = document.getElementById("txtTempId").value;
	var item_no = new Array();
	
	for (i=0; i<CountData; i++)
        {
          item_no[i]  = document.getElementById("txtDataNo"+(i+1)).value;  /*วนลูปเพื่อรับค่าจากฟอร์ม*/ 	  
        }

	var server_name = document.getElementById("txtServerName").value;
	
	HttPRequest = CreateObj();
	
	var url = 'http://'+server_name+'/ajax/view/AjaxPageData.php'; 
	
	var pmeters = "temp_id="  + encodeURI(temp_id )+		
				  "&item_no=" + encodeURI(item_no );

	/*ค่า pmeters จะเป็นแบบนี้ครับ temp_id=2&item_no=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16*/	
		    
	HttPRequest.open('POST',url,true);
	HttPRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	HttPRequest.setRequestHeader("Content-length", pmeters.length);
	HttPRequest.setRequestHeader("Connection", "close");
	HttPRequest.send(pmeters);
					
	HttPRequest.onreadystatechange = function()
	{
		if(HttPRequest.readyState == 4) // Return Request
		{
			document.getElementById("mySpanPageData").innerHTML = HttPRequest.responseText;	
		}
	}}

for ($i=0; $i < ($CountData); $i++)
{
	echo $_POST["item_no"][$i].'<br>';
   /*วนลูปบันทึกค่า item_no*/
}