Abstraction¶
An abstraction, or also an abstraction layer, is a way to hide the underlying complexity of some logic behind a simpler interface so that other parts of the program don’t need to worry about the details.
In that sense, it is related to the abstract keyword, which introduces a signature and leaves freedom of implementation.
Abstraction is also the name of the refactor to replace a piece of code by an easily changed piece of code.
<?php
echo 1; // displays 1
// This depends on the execution environment
const A = PHP_OS == 'win' ? 'Windows' : 'Others';
echo A; // display the value of A
?>
See also Abstraction in PHP.
Related : Abstract Keyword, Inlining, Facade, Over-engineer, Separation Of Concerns
