Interface abstract class A brief description of using interfaces, abstract classes, and ordinary base classes to implement 'interface-oriented programming' and 'coupling methods' in PHP-PHP Tutorial-php.cn

Copy the code The code is as follows:

/*
I am learning and doing it at the same time. It is published for the convenience of my own reading. It is also published with the guidance of experts. Welcome the guidance of experts...
[Tips] This example passed the test without error.
[Scenario Design]
Simulate the IDE interface of a computer motherboard. For example, the storage that the motherboard can access often includes optical drives, hard disks, flash memory, etc.
For convenience, it is necessary to set the same interface for these different storages.
This example also assumes that an unprecedented alien memory with a unique access method will also be added to the motherboard for access,
So a coupled design pattern needs to be adopted.
[The main description of this example]
1. The so-called "interface" mode is achieved through three methods: interface, abstract class, and general class inheritance. To illustrate:
A. Subclass objects can be used as parent class objects, because subclasses It is a special parent class!
B. Please pay attention to the base class writing method of interface, abstract class and general class inheritance in these three implementation methods!
2. The interface mode is really a contract!
3. "Coupling design pattern" of programming!
*/
//-------------------------------------------------- --------------------------
/*[Method 1] Interface implementation method:*/
interface readandwrite{
function read();
function write();
}
class motherboard{
private $storage;
function __construct(readandwrite $obj){
$this->storage=$obj;
}
function read(){
$this-> storage->read();
}
function write(){
$this->storage->write();
}
}
class flash implements readandwrite{
function __construct(){
echo "I It is flash memory:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data ......

";
}
}
class yingpan implements readandwrite{
function __construct(){
echo "I am the hard disk:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data...

";
}
}
class disco implements readandwrite{
function __construct(){
echo "I am a CD:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data...

";
}
}
//----------------- -------------------------------------------------- ---
/*[Method 2] Abstract class implementation:
abstract class readandwrite{
abstract function read();
abstract function write();
}
class motherboard{
private $storage;
function __construct(readandwrite $obj){
$this->storage=$obj;
}
function read(){
$this->storage->read();
}
function write(){
$this-> ;storage->write();
}
}
class flash extends readandwrite{
function __construct(){
echo "I am flash:
";
}
function read(){
echo "Start Read data...
";
}
function write(){
echo "Start storing data...

";
}
}
class yingpan extends readandwrite {
function __construct(){
echo "I am the hard disk:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data...

";
}
}
class disco extends readandwrite{
function __construct(){
echo "I am a CD:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data...< ;hr>";
}
}
*/
//---------------------------------- ----------------------------------
//[Method 3] General class inheritance implementation method:
/ *
class readandwrite{
function read(){
echo "reading............";
}
function write(){
echo "writing..... .......";
}
}
class motherboard{
private $storage;
function __construct(readandwrite $obj){
$this->storage=$obj;
}
function read(){
$this->storage->read();
}
function write(){
$this->storage->write();
}
}
class flash extends readandwrite{
function __construct( ){
echo "I am flash memory:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data...

";
}
}
class yingpan extends readandwrite{
function __construct(){
echo "I am the hard disk:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data...

";
}
}
class disco extends readandwrite{
function __construct(){
echo "I am a CD:
";
}
function read(){
echo "Start reading data...
";
}
function write(){
echo "Start storing data...

";
}
}
*/
//-------- -------------------------------------------------- ------------
/*
[Coupling mode]
Coupling mode is to combine two classes with different standards (in this case, the interface, abstract class, ordinary base class and alien storage are different access method),
through an intermediate converter to achieve the same standard, just like a patch cord - in this example, the Rdata and Wdata methods of the unknown class are converted
into read and write methods to achieve the same results as this example Interfaces, abstract classes, and ordinary base classes have the same access methods. The intermediate converter in this example is the
Apdater class.
Since only one class can be inherited in PHP but multiple interfaces can be inherited, three coupling methods have been produced:
Method 1: The intermediate converter Apdater class inherits abstract classes or ordinary base classes, but since PHP can only inherit one class , so define an unknown object of the alien memory class in the Apdater class, and use the method of overloading the access method of the inherited abstract class or ordinary base class to convert the access method to achieve the same access method.
Method 2: The intermediate converter Apdater class inherits the alien memory class unknown and interface. At this time, you can directly use the access methods of the Apdater class
(parent::Rdata() and parent::Wdata() - PHP neutron class method of calling the parent class method), and implement the interface specified method,
to convert the access method to achieve the purpose of the same access method.
Method three: Same as method one, except that it inherits (implements) the interface;
*/
//-------------------------- --------------------------------------------------
/*
【Method 1]
*/
/*
class unknow{
function __construct(){
echo "I am an alien storage unknown to the people on earth. I have access that is different from the storage on earth. Method:
";
}
function Rdata(){
echo "I'm reading now...
";
}
function Wdata(){
echo "I'm writing now...

";
}
}
class Adpater extends readandwrite{
private $obj;
function __construct(unknow $x){
$this->obj =$x;
}
function read(){
$this->obj->Rdata();
}
function write(){
$this->obj->Wdata();
}
}
*/
//------------------------------------------------ ----------------------------
/*
【Method 2】
class unknow{
function __construct(){
echo "< ;font color=#ff0000>I am an alien storage unknown to the people on earth. I have a different access method from the storage on earth:
";
}
function Rdata(){
echo "I'm reading now...
";
}
function Wdata(){
echo "I'm writing now...

";
}
}
class Adpater extends unknown implements readandwrite{
function read(){
parent::Rdata();
}
function write(){
parent::Wdata();
}
}
*/
//- -------------------------------------------------- ---------------------
/*
【Method 3】
*/
class unknow{
function __construct(){
echo "I am an alien storage unknown to people on Earth. I have a different access method from Earth's storage:
";
}
function Rdata(){
echo "I' m reading now...
";
}
function Wdata(){
echo "I'm writing now...

";
}
}
class Adpater implements readandwrite{
private $obj;
function __construct(unknow $x){
$this->obj=$x;
}
function read(){
$this->obj->Rdata();
}
function write(){
$this->obj->Wdata();
}
}
//[Program body call]
echo "Object-oriented programming - interface

";
$storage1=new flash();
$computer=new motherboard($storage1);
$computer-> ;read();
$computer->write();
$storage2=new yingpan();
$computer=new motherboard($storage2);
$computer->read();
$computer-> ;write();
$storage3=new disco();
$computer=new motherboard($storage3);
$computer->read();
$computer->write();
$un_storage=new unknow();
$apdaterx=new Adpater($un_storage);
$computer=new motherboard($apdaterx);
$computer->read();
$computer->write();
?>

The above is a brief introduction to the interface abstract class in PHP using interfaces, abstract classes, and ordinary base classes to implement "interface-oriented programming" and "coupling methods", including the content of interface abstract classes. I hope that friends who are interested in PHP tutorials will be able to helped.