Simple Type Casting in PHP

simple-type-casting.php

<?php # -*- coding: utf-8 -*-
header( 'Content-Type: text/plain;charset=utf-8' );

interface Simple_Type
{
	public function __construct( $var );

	public function __get( $var );
}

abstract class Simple_Type_Base implements Simple_Type
{
	protected $var;

	public function __construct( $var )
	{
		$this->var = $this->cast( $var );
	}

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

	abstract protected function cast( $var );
}

class Int extends Simple_Type_Base
{
	protected function cast( $var )
	{
		return (int) $var;
	}
}
class Float extends Simple_Type_Base
{
	protected function cast( $var )
	{
		return (float) $var;
	}
}
class String extends Simple_Type_Base
{
	protected function cast( $var )
	{
		return (string) $var;
	}
}

class Test
{
	public $string, $float, $int;

	public function take_string( String $string )
	{
		$this->string = $string->s;
	}

	public function take_float( Float $float )
	{
		$this->float = $float->f;
	}

	public function take_int( Int $int )
	{
		$this->int = $int->i;
	}
}

$string = new String( 1 );
$float  = new Float( 1.5 );
$int    = new Int( 1.0 );

$test = new Test;
$test->take_string( $string );
$test->take_float( $float );
$test->take_int( $int );

$result = get_object_vars( $test );

var_dump( $result );
/*
array(3) {
  ["string"]=>
  string(1) "1"
  ["float"]=>
  float(1.5)
  ["int"]=>
  int(1)
}
 */