Adding static code analysis tool support

[peter279k]

Is your feature request related to a problem? Please describe.

• Since PHPStan, Psalm or Phan is enabled by some PHP projects to do static code analysis.
• The static code analysis tool can check some issues on PHP codes without writing tests.

Describe the solution you'd like

• Choosing one of static code analysis tools that mentioned on above lists and enable this on this repository.

Describe alternatives you've considered N/A

Additional context

N/A