php framework - a tip about PHP class calling

PHP development frameworks like thinkPHP will encapsulate the operation classes of the database, and methods will be called, as shown in the following code:

<code>M('Test')->where(['status'=>1])->field('id,name')->select();</code>

What is the idea behind this implementation method? Is there any corresponding specific technical term?

Reply content:

PHP development frameworks like thinkPHP will encapsulate the operation classes of the database, and methods will be called, as shown in the following code:

<code>M('Test')->where(['status'=>1])->field('id,name')->select();</code>

What is the idea behind this implementation method? Is there any corresponding specific technical term?

Chained calls are implemented by returning $this.

Write a demo for you:

<code class="php"><?php 
/**
 * 简单的加减法计算类
 * 
 * @author Flc <2016-11-23 19:32:26>
 */
class Calc
{
    /**
     * 结果
     * @var integer
     */
    protected $result = 0;

    /**
     * 加法
     * @param number $value 
     */
    public function add($value)
    {
        $this->result += $value;

        return $this;
    }

    /**
     * 减法
     * @param  number $value 
     */
    public function sub($value)
    {
        $this->result -= $value;

        return $this;
    }

    /**
     * 返回结果
     * @return [type] [description]
     */
    public function result()
    {
        return $this->result;
    }
}

$calc = new Calc;
echo $calc
    ->add(1)
    ->add(2)
    ->sub(1)
    ->add(11)
    ->result();</code>

The key point is that each method’s <code>return $this;</code>

You can learn about the principles of the MVC model.
Then let’s take a look at class encapsulation.

M('Test') is actually equivalent to defining a TestModel class.

M('Test')->where(), calls the where method in this class.

The main difficulty lies in the implementation of the MVC model.
This is a tutorial on MVC model implementation, you can check it out.
https://www.shiyanlou.com/cou...

Chain call, return $this is ok, you can refer to various ORM frameworks

Is it a chain operation? Each time an object is returned

Chain operation, return $this, method call

Chain operation

<code>return $this;</code>

Everyone above is right. I'll make a connection.

<code>http://blog.csdn.net/zhengwish/article/details/51742880</code>

Chain calls return objects every time