PSR-4

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The PHP Standard Recommendations (PSRs) are recommendations aimed at improving interoperability between PHP Frameworks. There are several recommendations that have been validated including PSR-4 which focuses on auto-loading classes and which has been adopted by Drupal 8. PSR-4 describes a specification for automatic loading classes of file paths. The autoload allows you to include files without the use of "include" statements, based on the namespace path.