Difference between revisions of "PHP/interface"
< PHP
Jump to navigation
Jump to search
(Created page with "==About== 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 work...") |
|||
Line 7: | Line 7: | ||
*** narrows down (more closely specifies) the function's expectations of a passed or returned object | *** 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 | *** does not tie the object to a specific class hierarchy | ||
− | == | + | ==Predefined== |
− | * [https://www.php.net/manual/en/ | + | * {{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== | ==Links== | ||
* official: [https://www.php.net/manual/en/language.oop5.interfaces.php interfaces] | * official: [https://www.php.net/manual/en/language.oop5.interfaces.php interfaces] | ||
+ | * '''2018-01-13''' [https://daylerees.com/php-interfaces-explained/ PHP Interfaces Explained] |
Revision as of 01:08, 13 January 2020
About
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
- Advantages over declaring the object as a class:
Predefined
- instanceof works with both classes and interfaces
- interface_exists() returns TRUE if the interface has been declared in code that has executed.
Links
- official: interfaces
- 2018-01-13 PHP Interfaces Explained