How to define constants in PHP

illustrate

1. Variables in PHP refer to the amount that the value used in the program can change, and the opposite is a constant.

2. After the constant value is defined, it cannot be changed anywhere else in the script.

Format

 define ( string $name , mixed $value , bool $case_insensitive = false )

$name: regular name.

$value: constant value; in PHP5, value must be a standard value (int, float, string, boolean, null), or it can be an array value in PHP7.

$case_insensitive: If set to true, the case is not sensitive. By default, case is sensitive. PHP7.3.0 deprecated the definition of case-insensitive constants.

Return value: true on success, false on failure.

Example

Allowed to be array

 define('People', array(

'man',

'woman',

'strick'

));

echo People[1];

?>

1

 Output: woman

The above is how to define constants in PHP. I hope it will be helpful to everyone.