PHP method chaining ($this)

method-chaining.php

<?php

class fakeString
{
    private $str;
    function __construct($str = null)
    {
        $this->str = $str;
    }

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

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

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

    function returnThis(){
        return $this;
    }
}


$a = new fakeString("Hello,");

var_dump($a);
echo "<br />";
var_dump($a->returnThis());

echo "<br />";
echo $a->returnThis()->addA()->addB()->getStr();