如何定义这种php函数？

Question

I saw some sample php scripts can use a function after one another, but I can't find how to write script like that.

When I write the php script:

class apple {
  function banana() {
    echo 'Hi!';
  }
}

It looks like this when I want to call the function banana:

$apple = new apple;
$apple->banana();

What if I want to call a function right after the previous one, like this:

$apple->banana()->orange()

I've tried to put an function inside another, but it returns with error. How can I write the script like this?

Answer 1

This code is to improve your method chaining,

    <?php

    class Fruits
    {
        public function banana()
        {
            echo 'Hi i am banana!'.'<br>';
            return $this;
        }

        public function orange()
        {
            echo 'Hi i am orange!'.'<br>';
            return $this;
        }

        public function __call($mName,$mValues)
        {
            echo 'Hi i am '.$mName.'!'.'<br>';
            return $this;
        }
    }

    $fruits = new Fruits();
    $fruits->banana()->orange()->grape()->avocado();