Thanks!
Just one more questions regarding this script...header.html includes line: require('../mysqli_connect.php');
I presume this line will point to the mysqli_connect.php file, that is, per your safety recommendations, located outside web directory. if header.html file is located on my PC in C:/xampp/htdocs/includes folder, and htdocs is my web directory, mysqli_connect.php file should be located in xampp folder (two levels up from includes folder)? Do I need to change script line from ../mysqli_connect.php to ../../mysqli_connect.php?
Appreciate your help very much!