メソッドチェーンとは、メソッドをアロー演算子で複数つなぎ、複数のメソッドを一度に行うことです。
サンプルを見てみましょう。
<?php
class Product
{
private $price = 100;
public function getPrice()
{
return $this->price;
}
}
class Cart
{
private $products = array();
public function add($product)
{
$this->products[] = $product;
}
public function get($index)
{
return $this->products[$index];
}
}
$cart = new Cart();
$product = new Product();
$cart->add($product);
$prd = $cart->get(0);
$price = $prd->getPrice();
$price = $cart->get(0)->getPrice();
?>
<?php
class Date
{
private $_timestamp;
public function __construct()
{
$this->_timestamp = time();
}
public function addDay($days)
{
if (true == preg_match('/^[0-9]+$/', $days)){
$str = sprintf('+%s day', $days);
$this->_timstamp = strtotime($str, $this->_timestamp);
}
}
public function format($format)
{
return date($format, $this->_timestamp);
}
}
$date = new Date();
$date->addDay(3);
$fmt = $date->format('Y/m/d H:i');
var_dump($fmt);
?>
<?php
class Chain {
protected $price;
protected $quantity;
protected $option;
public function setPrice($price){
$this->price = $price;
return $this;
}
public function setQuantity($quantity){
$this->quantity = $quantity;
return $this;
}
public function setOption($option){
$this->optioin = $option;
return $this;
}
public function get(){
$amount = $this->price * $this->quantity;
foreach ($this->option as $key => $val){
if ($key == 'tax') $amount -= ceil($amount * $val);
elseif($key == 'discount') $amount -= $val;
}
return $amount;
}
}
$chain = new Chain();
$chain
->setPrice(100)
->setQuantity(5)
->setOption(array(
'tax' => '0.05',
'discount' => '150'
));
$total_amount = $chain->get();
echo $total_amount;
?>
