What 's method chaining? how to implement it on PHP?

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.

Example:

<?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"

The ability to return one object from multi functions.