PHP，返回类作为对象

Question

I am testing the way writing PHP like js, and I wonder if this will be possible.

If say I have A, B function in Class C.

Class C{
   function A(){

   }
   function B(){

   }
}
$D = new C;

$D->A()->B(); // <- Is this possible and how??

In Js, we can simple write like DA().B();

I tried return $this inside of function A() , didnt work.

Thank you very much for your advice.

Answer 1

What you are looking for is called fluent interface. You can implement it by making your class methods return themselves:

Class C{
   function A(){
        return $this;
   }
   function B(){
        return $this;
   }
}

Answer 2

Returning $this inside the method A() is actually the way to go. Please show us the code that supposedly didn't work (there probably was another error in that code).

Answer 3

Its rather simple really, you have a series of mutator methods that all returns the original (or other) objects, that way you can keep calling functions.

<?php
class fakeString
{
    private $str;
    function __construct()
    {
        $this->str = "";
    }

    function addA()
    {
        $this->str .= "a";
        return $this;
    }

    function addB()
    {
        $this->str .= "b";
        return $this;
    }

    function getStr()
    {
        return $this->str;
    }
}


$a = new fakeString();


echo $a->addA()->addB()->getStr();

This outputs "ab"

Returning $this inside the function allows you to call the other function with the same object just like jQuery does.

Answer 4

I tried it and it worked

<?php

class C
{
  public function a() { return $this; }
  public function b(){ }
}

$c = new C();
$c->a()->b();
?>