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Mastering PHP 7 by Branko Ajzele

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PSR-2 - coding style guide

PSR-2 is an extension of PSR-1. This means that when talking about PSR-2, the PSR-1 standard is sort of implicitly understood. The difference is that PSR-2 expands beyond basic class and function formatting by enumerating a set of rules on how to format PHP code. The outlined style rules are derived shared similarities across the various PFP-FIG member projects.

Code MUST follow a coding style guide PSR (PSR-1). Goes to say that every PSR-2 code is implicitly PSR-1 compliant.

Code MUST use 4 spaces for indenting, not tabs. The spaces versus tabs dilemma is quite an old one in the programming world. There are those who the PHP-FIG group voted for the use of spaces, whereas 4 spaces represent what is usually a single ...

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