重點在於,返回$this指標,方便呼叫後者函式。
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 IMoocOperation(10);
$result = $operation->add(2)->decrease(2)
->multiply(3)->division(4)
->get();
var_dump($result);
執行結果
masaki@masaki-Inspiron:/var/www/imooc$ php index.php
float(7.5)