What are the ways of defining php constants

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Description

1. Const defines PI as a variable. The definition constant can only be placed in the top-level directory, not in the if statement or in the {} of function.

2. Define is a macro definition, and the definition constant can be placed anywhere.

Note that a macro definition is not a statement in the strict sense of C or C++, so there is no semicolon at the end of the line.

Example

Symbol constant # define Pi 3.1415926f; constant variable const float pi 3.1415926f what is the frame of php php:

1. Laravel,Laravel is a free and open source PHP application framework.

2. Phalcon,Phalcon is the fastest PHP framework.

3. Symfony,Symfony is a PHP framework for Web projects.

4. Yii,Yii is a fast, secure and professional PHP framework.

CodeIgniter,CodeIgniter is a very agile open source PHP framework.

6. CakePHP,CakePHP is an old PHP framework.

7. Kohana,Kohana is an agile but powerful PHP framework.

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