ผมแก้ยังไงก็ไม่ได้ ผิด พลาดตรงใหนครับ กับ หน้า อัพไฟล์

<?php
	require_once("connectdb.php");
	$objCon = mysqli_connect($host,$username,$password,$dbname);
	mysqli_set_charset($objCon,"utf8");
	
	function createName($f){
	$resend = explode(".",$f);
	$ext = $GLOBALS["newName"].".".end($resend);
	return $ext;
	}

	$newName = time();
	
	if((copy($_FILES["cover_file"]["tmp_name"],"/upload/".createName($_FILES["cover_file"]["name"]))) && 
	  (copy($_FILES["journal_file"]["tmp_name"],"/upload/".createName($_FILES["journal_file"]["name"]))))

	{
		
		$img_cover = $_FILES["cover_file"]["name"];
		$img_file = $_FILES["journal_file"]["name"];
		$txtall = ' Years : '.$_POST['j_volume'].' ON. : '.$_POST['j_no'].' <br> '.$_POST['j_issue'];
	   // $strSQL = "INSERT INTO save_data (discrip,j_cover,j_fullfile,random_cover,random_journal) VALUES 
	    //('".$_POST["txtdis"]."','$img_cover','$img_file','".createName($_FILES["cover_file"]["name"])."',
	    //												 '".createName($_FILES["journal_file"]["name"])."')";

	    $strSQL = "INSERT INTO upload_file_e (description,name_cover,name_file,random_cover,random_file) VALUES
	    ('$txtall','$img_cover','$img_file','".createName($img_cover)."','".createName($img_file)."')";

        // ('".$_POST["txtdis"]."','$img_cover','$img_file','".createName($img_cover)."','".createName($img_file)."')";
   
	    $objQuery = mysqli_query($objCon,$strSQL);
	
        header("location:ad_file.php");
  	}

?>