Fix: Add opening tags and strict declaration to examples

[localheinz]

This PR

• adds opening tags and strict declarations to examples

[codecov]

Codecov Report

Merging #6 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master     #6   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity       27     27           
=======================================
  Files             5      5           
  Lines            55     55           
=======================================
  Hits             55     55

Impacted Files	Coverage Δ	Complexity Δ
src/SystemVariables.php
src/Production.php	100% <0%> (ø)	12% <0%> (?)

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