Php Constants
In PHP, constants are identifiers (names) that represent a fixed value that cannot be changed during the execution of a script.
Constants can be useful for improving code readability, avoiding magic numbers, and ensuring that certain values are not accidentally modified.
Create a php constants
To create a constant in PHP, you use the define() function.
Syntax
define("name", value, case_insensitive);
Parameters
name : The name of the constant, usually written in uppercase letters.
value: The value assigned to the constant.
case_insensitive: Optional. If set to true, the constant's name will be case-insensitive. Default is false.
Php constants array
The array itself, though, cannot be redefined once defined using the define() function.
<?php
define("FRUITS", ["apple", "banana", "orange"]);
echo echo FRUITS[0];
?>
// Outputs: apple
Constants are global
it is available and accessible from anywhere in your script, regardless of the scope.
<?php
define("my constants", "Hello world!");
function myFunction() {
echo my constants();
}
myFunction();
?>
// output Hello world
