The concepts and differences between PHP abstract classes and interfaces-PHP Tutorial-php.cn

The concepts and differences between PHP abstract classes and interfaces

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Release： 2016-07-25 09:07:38

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//1. Define some methods, and the subclass must fully implement all methods in this abstraction
//2. Objects cannot be created from abstract classes. The meaning of this is Being extended
//3. Abstract classes usually have abstract methods, and there are no braces in the methods
//4. Abstract methods do not have to implement specific functions, and are completed by subclasses
//5. Implement methods of abstract classes in subclasses When, the visibility of its subclass must be greater than or equal to the definition of the abstract method
//6. The method of the abstract class can have parameters or be empty
//7. If the abstract method has parameters, then the implementation of the subclass also Must have the same number of parameters
///////////////////////////////Interface class Definition:
interface Shop{
public function buy($gid);
public function sell($gid);
abstract function view($gid);
}
//If you want to use the interface, you must define all the parameters in the interface class No method can be missing (except abstract).
//In this way, if in a large project, no matter how others do the following method, they must implement all the methods in this interface!
//Example: Implement the above A method of the interface
class BaseShop implements Shop{
public function buy($gid){
echo 'You purchased the product with the ID:' . $gid . '';
}
public function sell($gid){
echo 'You purchased and sold products with ID:' . $gid . '';
}
public function view($gid){
echo 'You browsed products with ID:' . $gid . '';
}
}
//Example of multiple inheritance of interface:
interface staff_i1{ //Interface 1
function setID();
function getID();
}< /p>
interface staff_i2{ //Interface 2
function setName();
function getName();
}
class staff implements staff_i1,staff_i2{
private $id ;
private $name;
function setID($id){
$this->id = $id;
}
function getID(){
return $this->id ;
}
function setName($name){
$this->name = $name;
}
function getName(){
return $this->name;
}
function otherFunc(){ //This is a method that does not exist in the interface
echo “Test”;
}
}
?>< ;/p>

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