I try to execute the example.php

I don't understand where we add the url parameter

Notice: Undefined index: page in C:\wamp\www\essai\example.php on line 18

Notice: Undefined index: rows in C:\wamp\www\essai\example.php on line 21

Notice: Undefined index: sidx in C:\wamp\www\essai\example.php on line 24

Notice: Undefined index: sord in C:\wamp\www\essai\example.php on line 26

Warning: Division by zero in C:\wamp\www\essai\example.php on line 44
Couldn t execute query.You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1