php链式操作实现四则链式运算

重点在于，返回 $this 指针，方便调用后者函数。
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 division($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 = $operation->add(2)->decrease(2)
->multiply(3)->division(4)
->get();
var_dump($result);
执行结果
masaki@masaki-Inspiron:/var/www/imooc$ php index.phpfloat(7.5)