PHP method chaining or fluent interface?

user_1026244 0
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I am using PHP 5 and I've heard of a new featured in the object-oriented approach, called 'method chaining'. What is it exactly? How do I implement it?

fluent-interface method-chaining oop php
10 Answers

A fluent interface allows you to chain method calls, which results in less typed characters when applying multiple operations on the same object.

class Bill { 

    public $dinner    = 20;

    public $desserts  = 5;

    public $bill;

    public function dinner( $person ) {
        $this->bill += $this->dinner * $person;
        return $this;
    }
    public function dessert( $person ) {
        $this->bill += $this->desserts * $person;
        return $this;
    }
}

$bill = new Bill();

echo $bill->dinner( 2 )->dessert( 3 )->bill;
user_142728650

I think this is the most relevant answer.

<?php

class Calculator
{
  protected $result = 0;

  public function sum($num)
  {
    $this->result += $num;
    return $this;
  }

  public function sub($num)
  {
    $this->result -= $num;
    return $this;
  }

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

$calculator = new Calculator;
echo $calculator->sum(10)->sub(5)->sum(3)->result(); // 8
user_117031050
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