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Chapter 1. About TYPO3 API > PHP Classes and Files

PHP Classes and Files

There are certain conventions concerning file and class naming in TYPO3. They must be used in extensions too and knowing these conventions helps to locate files quickly.

Each class file starts with class. and is followed by a class name in lower case. The file ends with a .php extension. There are certain exceptions to this rule, and they will be described in this book. These exceptions exist due to historical reasons, and no new class may become an exception.


  

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