Improve PHP Coding Standards

[MathiasReker]

Proposed changes

This PR improves the coding standards.

Types of changes

What types of changes does your code introduce to Phpfastcache?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing code/behavior)
• Deprecated third party dependency update
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation/Typo/Resource update that does not involve any code modification

Agreement

I have read the CONTRIBUTING and CODING GUIDELINE docs

Further comments

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[Geolim4]

Hello,

Multiple points:

• Yoda conditions are not part of PSR-12 and I don't like them personally because it increase the cognitive load.
• PHP Core functions must remain prefixed with \ because of small opcache optimization benefit
• bin/stubs should not be touched as it is used for phpmd/phpstan quality tools
• mb_ replacement functions could introduce BC break or undersired behaviors, so I won't take any risks on it
• Some lines are too long

It's kind but for now the code style has been carefully studied and will stay as is.

Thanks .