PHP/interface: Difference between revisions

Revision as of 01:08, 13 January 2020

In PHP, an interface is a set of public method-functions which can be required in either of two circumstances:

in the declaration of a class
- This works almost identically to declaring the interface's methods as abstract functions in a trait or parent class.
the type of a function argument or return value
- Advantages over declaring the object as a class:
  - narrows down (more closely specifies) the function's expectations of a passed or returned object
  - does not tie the object to a specific class hierarchy

instanceof works with both classes and interfaces
- official
interface_exists() returns TRUE if the interface has been declared in code that has executed.
- official

@@ Line 7: / Line 7: @@
 *** narrows down (more closely specifies) the function's expectations of a passed or returned object
 *** does not tie the object to a specific class hierarchy
-==Functions==
+==Predefined==
-* [https://www.php.net/manual/en/function.interface-exists.php interface_exists()] returns TRUE if the interface has been declared in code that has executed.
+* {{l/sub|instanceof}} works with both classes and interfaces
+** [https://www.php.net/manual/en/language.operators.type.php official]
+* {{l/sub|interface_exists()}} returns TRUE if the interface has been declared in code that has executed.
+** [https://www.php.net/manual/en/function.interface-exists.php official]
 ==Links==
 * official: [https://www.php.net/manual/en/language.oop5.interfaces.php interfaces]
+* '''2018-01-13''' [https://daylerees.com/php-interfaces-explained/ PHP Interfaces Explained]