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    Part I: PHP Fundamentals > Variables, Operators, Data Types, and File Inclusion

    Chapter 4. Variables, Operators, Data Types, and File Inclusion

    This chapter examines how you define, declare, assign, compare, and process variables. It covers the following topics:

    • Variables

      • User-defined variables

      • Operators

      • Data types

      • Global variables

      • Predefined variables

    • Library file inclusion

    • Reserved words and system constants


      

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