PHP Case Sensitivity

My Website is : www.freetimelearning.com

Warning: Undefined variable $fTl in /home/myads9010/public_html/php/examples/case-sensitivity-2.php on line 12
My Website is :

Warning: Undefined variable $FTL in /home/myads9010/public_html/php/examples/case-sensitivity-2.php on line 13
My Website is :