Inclusions¶
Inclusion is the operation to add PHP code stored in an external file, into another PHP code.
Inclusions rely on four native functions: include, require, include_once, require_once.
Inclusions have application with templates, configurations, caches, function libraries.
Inclusions have been superseded by autoload in recent PHP versions. Autoload relies on inclusion, though.
<?php
echo "A $color $fruit"; // A
include 'vars.php';
echo "A $color $fruit"; // A green apple
?>
See also https://www.phptutorial.net/php-tutorial/php-include-file/, https://www.simplilearn.com/tutorials/php-tutorial/include-in-php
Related : Class Autoloading
Added in PHP 8.0+
