- Replaced TRUE/FALSE constants with true/false keywords
- Replaced NULL constant with null keyword
- Replaced `<?php echo` in views with shortened `<?=`
- Added missing variable declaration
- Added missing function return type in declaration
- replaced `== true`, `== false`, `=== true` and `=== false` in if statements with simplified forms
- getSearch functions to properly retrieve HTTP vars.
- getVar() function calls replaced with getGet() or getPost()
- replaced TRUE/FALSE constants with true/false keywords