PHP+Postgres ขึ้น ERROR: invalid byte sequence for encoding "UTF8" ครับ

<script src="./includes/Ajax_Framework1.js"></script>
<script language="javascript">
<!--
function ajaxshow(p){	
	//var data = getFormData("frmpsm");
	
	var data = "pers="+document.getElementById("pers").value
		+"&persTitle="+document.getElementById("persTitle").value
		+"&persSearch="+document.getElementById("persSearch").value;
	
	
	if(!p){p = 1;}
	
	var url = "frmpersonal_data.php?page=" + p + "&sid=" + Math.random();
	ajaxLoad("post", url, data, "displayId");
	//document.getElementById("person_username").focus();
}

function ajaxLoad(method, URL, data, displayId){
	var ajax = null;
	try{
		// Firefox, Opera 8.0+, Safari, Chrome
		ajax = new XMLHttpRequest();
	}catch(e){
		// Internet Explorer
		try{
			ajax = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(e){
			try{
				ajax = new ActiveXObject("Microsoft.XMLHTTP");
			}catch(e){
				alert("Your Browser Don't Support AJAX!");
				return false;
			}
		}
	}

	method = method.toLowerCase();
	URL += "?dummy=" + (new Date()).getTime();
	if(method=="get"){
		URL += "&" + data;
		data = null;
	}

	ajax.open(method, URL);

	if(method=="post"){
		ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	}
	
	ajax.onreadystatechange = function(){//RequestState
		if(ajax.readyState==4 && ajax.status==200){	
			var ctype = ajax.getResponseHeader("Content-Type").toLowerCase();
			ajaxCallback(ctype, displayId, ajax.responseText);
			delete ajax;
			ajax = null;
			setTimeout("doStart()", 1000);	
		}else{
			document.getElementById("displayId").innerHTML = "<div id='loadingShow'><br><br><font face='Tahoma' size='2'><img src='./images/loading1.gif' border='0'><br><br><br>ขณะนี้กำลัง Loading...&nbsp;&nbsp;กรุณารอสักครู่<br></font></div>";
		}
	}
	ajax.send(data);
}

function ajaxCallback(contentType, displayId, responseText){
	if(contentType.match("text/javascript")){
		eval(responseText);
	}
	else {
		var el = document.getElementById(displayId);
		el.innerHTML = responseText;
	}
}

function getFormData(form_name_or_id){	
	var frm = document.forms[form_name_or_id];
	if(frm==null){
		alert("form not found!");
		return;
	}

	var data = "";
	var num_el = frm.elements.length;
	for(i=0; i<num_el; i++){
		var el = frm.elements[i];
		if(el.name=="" && el.id==""){
			continue;
		}
		var param_name = "";
		if(el.name!=""){
			param_name = el.name;
		}
		else if(el.id!=""){
			param_name = el.id;
		}

		var t = frm.elements[i].type;
		var value = "";
		if(t=="text"||t=="password"||t=="hidden"||t=="textarea"){
			value = encodeURI(el.value);
		}
		else if(t=="radio"||t=="checkbox"){
			if(el.checked){
				value = encodeURI(el.value);
			}
			else{
				continue;
			}
		}
		else if(t=="select-one"){
			value = encodeURI(el.options[el.selectedIndex].value);
		}
		else if(t=="select-multiple"){
			for(j=0; j<el.length; j++){
				if(el.options[j].selected){
					if(data!=""){
						data += "&";
					}
					data += param_name + "=";
					data += encodeURI(select.options[j].value);
				}
			}
			
			continue;
		}
		if(data!=""){
			data += "&";
		}
		data += param_name + "=" + value;
	}

	return data;
}

$explode_name = preg_split('/\s+/', $searchtxt);

$explode_name = preg_split('/\s+/u', $searchtxt);
//หรือ
$explode_name = preg_split('/\p{Z}+/', $searchtxt);

$explode_name = explode(' ', $searchtxt);