Structs in PHP

struct.php

<?php

// Wow this whole thing is horrible
class Struct
{
    public function __construct($properties)
    {
        foreach ($properties as $key => $value) {
            if (property_exists($this, $key)) {
                $this->{$key} = $value;
            }
        }
    }

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

    public function __call($key, $args)
    {
        $struct = clone $this;
        $struct->{$key} = $args[0];
        return $struct;
    }
}


// Structs just extend Struct and define the necessary properties
class Point extends Struct
{
    protected $x;
    protected $y;
}



// Instantiate by using an array to simulate named parameters
$point = new Point(['x' => 5, 'y' => 10]);

// Mutating a struct returns a new struct
$new_point = $point->y(12);
var_dump($point == $new_point); // false


// Two points with the same properties are (loosely) the same
$same_point = new Point(['x' => 5, 'y' => 10]);
var_dump($point == $same_point); // true