ตรวจสอบค่าว่างก่อนทำการโพสหรืออัพโหลดขอ้มูลผมต้อง แทรก code ตรงไหนครับ

<?
include("conection2.php");
include("function.php");

CheckSession();
foreach($_POST as $key => $value) {
	$value=mysql_real_escape_string($value);
	//echo $key."/".$value."</br>";
}
//$return_to_page="../articles.php";
$return_to_page="../articles_list.php?";


if($_POST["METHOD"]=="remove_ban"){
	if(unlink($_POST["IMAGE_REMOVE"])){ //DELETE IMG***********************************************************
		update_pic("","BANNER",$_POST["txtARTICLES_ID"]);
	}
	echo "<form action='".$return_to_page."' method='post' name='frm'>";
	echo '<input name="txtCATEGORY" type="hidden" id="txtCATEGORY" value="'.$_POST["txtCATEGORY"].'" />';
	echo '<input name="edit_id" type="hidden" id="edit_id" value="'.$_POST["txtARTICLES_ID"].'" />';
	echo "</form>";
	
}elseif($_POST["METHOD"]=="remove_img"){
	if(unlink($_POST["IMAGE_REMOVE"])){ //DELETE IMG***********************************************************
		update_pic("","IMAGE",$_POST["txtARTICLES_ID"]);
	}
	echo "<form action='".$return_to_page."' method='post' name='frm'>";
	echo '<input name="txtCATEGORY" type="hidden" id="txtCATEGORY" value="'.$_POST["txtCATEGORY"].'" />';
	echo '<input name="edit_id" type="hidden" id="edit_id" value="'.$_POST["txtARTICLES_ID"].'" />';
	echo "</form>";
	
}elseif(trim($_POST["txtARTICLES_ID"])!=""){
	

	$sql=" UPDATE  tb_articles ";
	$sql.=" SET TITLE =  '".$_POST["txtTitle"]."',";
	$sql.=" PROVINCE =  '".$_POST["txtPROVINCE"]."',";
	$sql.=" HILINGHT =  '".$_POST["chkHilight"]."',";
	$sql.=" `DESC` =  '".$_POST["editor1"]."'"; 
	$sql.=" WHERE ARTICLES_ID =".$_POST["txtARTICLES_ID"]." LIMIT 1 ;";
	$rs = mysql_query($sql); 
	$sql="";
//Upload***********************************************************
	//if($_FILES["ImageUpload"]["tmp_name"]!=""){
		$Banner=GenName_Pic($_FILES["BannerUpload"],"BANNER",$_POST["txtARTICLES_ID"]);
		if(copy($_FILES["BannerUpload"]["tmp_name"],$img_path.$Banner) )
		{			
			update_pic($Banner,"BANNER",$_POST["txtARTICLES_ID"]);
		}
	//}
	//if($_FILES["ImageUpload"]["tmp_name"]!=" "){
		$img=GenName_Pic($_FILES["ImageUpload"],"IMG",$_POST["txtARTICLES_ID"]);
		if(copy($_FILES["ImageUpload"]["tmp_name"],$img_path.$img ))
		{
			update_pic($img,"IMAGE",$_POST["txtARTICLES_ID"]);
		}
	//}
//Upload***********************************************************

	echo "<form action='".$return_to_page."' method='post' name='frm'>";
	echo '<input name="txtCATEGORY" type="hidden" id="txtCATEGORY" value="'.$_POST["txtCATEGORY"].'" />';
	echo '<input name="edit_id" type="hidden" id="edit_id" value="'.$_POST["txtARTICLES_ID"].'" />';
	echo "</form>";
	
}elseif(trim($_POST["txtTitle"])!=""){

	$sql="INSERT INTO  tb_articles (";
	$sql.=" ARTICLES_ID ,";
	$sql.=" CATEGORY ,";
	$sql.=" TITLE ,";
	$sql.=" PROVINCE ," ;
	$sql.=" HILINGHT ,";
	$sql.=" `DESC` ,";
	$sql.=" `ACTIVE` ," ;
	$sql.=" INACTIVE ,";
	$sql.=" CREATE_DT";
	$sql.=" )VALUES(";
	$sql.=" NULL ,";
	$sql.=" '".$_POST["txtCATEGORY"]."',";  
	$sql.=" '".$_POST["txtTitle"]."',";
	$sql.=" '".$_POST["txtPROVINCE"]."',";
	$sql.=" '".$_POST["chkHilight"]."',";
	$sql.=" '".$_POST["editor1"]."',";

	$sql.=" '1',";
	$sql.=" NULL,";
	$sql.=" now());";
	$rs = mysql_query($sql); 
	$sql="";
	$last_id = mysql_insert_id($db);
	$Banner=GenName_Pic($_FILES["BannerUpload"],"BANNER",$last_id);
	$img=GenName_Pic($_FILES["ImageUpload"],"IMG",$last_id);
	//Upload***********************************************************
	if(copy($_FILES["BannerUpload"]["tmp_name"],$img_path.$Banner) )
	{
		update_pic($Banner,"BANNER",$last_id);
	}
	if(copy($_FILES["ImageUpload"]["tmp_name"],$img_path.$img ))
	{
		update_pic($img,"IMAGE",$last_id);
	}
	//Upload***********************************************************
	echo "<form action='".$return_to_page."' method='post' name='frm'>";
	echo '<input name="txtCATEGORY" type="hidden" id="txtCATEGORY" value="'.$_POST["txtCATEGORY"].'" />';
	echo '<input name="edit_id" type="hidden" id="edit_id" value="'.$last_id.'" />';
	echo "</form>";
		
}

for($i=1;$i<10+1;$i++)
{
	json_set_list_News($i);
	json_set_list_Event($i);
}
json_set_list_ads();
json_set_list_ads_event();
json_set_list_ads_news();



$direc='<script language="JavaScript">document.frm.submit();</script>';
echo $direc;
mysql_close();

?>