Avoid OOP forms, POP ideas_PHP tutorial

Avoid the form of OOP, the idea of ​​​​POP
I haven’t posted a technical article for a long time. Today I saw a brother posted this post in 21PHP and forwarded it. It is useful for strengthening the learning of OOP
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Avoid the form of OOP, the idea of ​​​​POP
With the enhancement of PHP's support for OOP (object-oriented programming) and the development of programming ideas, more and more PHP programmers have entered The world of OOP. Through simple learning, most programmers can
quickly master the basic skills of OOP programming. There are more and more strings such as class and new in the code written by programmers. But as a program As a programmer, have you fallen into a programming trap of OO form and PO thinking?
As programmers in the POP era, in order to calculate the price of all the doors of a house, they will write such a function .
Code:
/******************************************
Function: priceOfHouseDoor($num, $price)
Function: Calculate the sum of the prices of all doors
Parameters: $num the number of doors, $price the price of each door
Remarks: surfchen @ http://www.yubeinet.com/
***********************************************/
function priceHouseDoor($num,$price)
{
return $num*$price;
}
echo priceHouseDoor(2,5);//Output price
or simply update the process:
Code:
$doors=2;//Number of doors
$price=5;// Price of each door
echo $doors*$price;//Output price
This is a typical POP. After understanding OOP, many people may change the code that implements this function. Perhaps, programmers It would be written like this:
Code:
class house
{
/******************************************

Function: getDoorPrice( $num,$price)
Function: Calculate the sum of the prices of all doors
Parameters: $num number of doors, $price price of each door
Remarks: surfchen @ http://www.yubeinet .com/
******************************************/
function getDoorPrice($num,$price)
{
return $ num*$price;
}
}
$house=new house;
echo $house->getDoorPrice(2,5);//Output price
We can see it at once , this code uses the representatives of OOP - classes and instantiation. So, is this object-oriented programming?
I took a closer look and found that this class is actually just the priceOfHouseDoor($num,$ price) function.
Well, now let’s discuss what object-oriented programming is. My understanding is: object-oriented programming has two core contents. One is classes, and the other is instances. Classes are An abstraction of a class of things, and instances
are individuals in this class of things. The attributes (values) and methods (functions) of instances are the specific content and actions of this individual respectively.
We Let’s take a look at the house class above. It has a method, getDoorPrice($num,$price), which introduces two parameters. One is the number of doors in the house, and the other is the door price of the house. We
found that when When we use this method, these two values ​​​​are constructed temporarily and do not form any connection with the house. In real life, the door in a house has no connection with the house, which is incomprehensible. ..As we know, OOP is actually a microcosm of our real world. Therefore, the house in OOP has no connection with the door of the house, and it is also incomprehensible. The thinking of right and wrong OO
.
Then , how should we use real OO to achieve the above functions? Please see the following code:
Code:
class house
{
var $doors;//Number of doors
var $ pricePerDoors;//The price of each door
function setNumOfDoors($num){$this->doors=$num;}//Set the number of doors
function setPricePerDoor($price){$this->pricePerDoors =$price;}//Set the price of each door
/*************
*Get the price of the door*
*************/
function getDoorPrice()
{
return ($this->doors)*($ this->pricePerDoors);
}
}
$house=new house;
$house->setNumOfDoors(2);//Set the number of doors
$house->setPricePerDoor( 5);//Set the price of each door
echo $house->getDoorPrice();//Output
We can clearly see that the number of doors and the price of the house in the above code have been combined Together. This is the real object-oriented.
Don’t you think? ^_^

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