What is a constant and how to use it correctly?-Grammar of PHP development basics-php.cn

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Grammar of PHP development basics

Chapter1 Course Introduction and Development Tools
1-1 PHP Development Basics Course Preview
1-2 Installation and configuration of PHP toolbox and phpStorm editor
1-3 Variables and functions in PHP
Chapter2 Detailed explanation of variables in PHP
2-1 Where should variables in PHP be defined?
2-2 How to access global variables in a function?
2-3 What are the types of variables in PHP?
2-4 How to create and use scopes?
2-5 What is a constant and how to use it correctly?
Chapter3 Detailed explanation of functions in PHP
3-1 What are anonymous functions and self-calling functions?
3-2 It turns out that the parameters of functions are so interesting: required/default/local variables
3-3 What is a callback function and how to execute it?
3-4 Playing with anonymous functions and closures
Chapter4 Process control in PHP
4-1 How much do you know about the branch structure in PHP?
4-2 How many loop structures are there in PHP?

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