How to use chain operations to implement four arithmetic operations in PHP? (code)

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The key point is to return the $this pointer to facilitate calling the latter function.

Operation.php

<?php

namespace IMooc;

class Operation
{
    protected $number = 0;

    public function __construct($number)
    {
        $this->number = $number;
    }
    public function add($number)
    {
        $this->number += $number;
        return $this;
    }

    public function decrease($number)
    {
        $this->number -= $number;
        return $this;
    }

    public function multiply($number)
    {
        $this->number *= $number;
        return $this;
    }

    public function pision($number)
    {
        $this->number /= $number;
        return $this;
    }

    public function get()
    {
        return $this->number;
    }
}

index.php

require __DIR__ . '/IMooc/Operation.php';
$operation = new IMooc\Operation(10);
$result = $operation->add(2)->decrease(2)
    ->multiply(3)->pision(4)
    ->get();
var_dump($result);

Execution result

masaki@masaki-Inspiron:/var/www /imooc$ php index.php
float(7.5)

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