Example of PHP traits to implement real properties in PHP classes

trait.properties.php

<?php
/**
 * Real properties PHP trait
 * Requirements: PHP 5.4 or later
 */
trait Properties
{
	protected $properties;

	public function __get($name)
	{
		if (method_exists($this, ($method = 'get_'.$name)))
		{
			return $this->$method();
		}
		else return;
	}

	public function __isset($name)
	{
		if (method_exists($this, ($method = 'isset_'.$name)))
		{
			return $this->$method();
		}
		else return;
	}

	public function __set($name, $value)
	{
		if (method_exists($this, ($method = 'set_'.$name)))
		{
			$this->$method($value);
		}
	}

	public function __unset($name)
	{
		if (method_exists($this, ($method = 'unset_'.$name)))
		{
			$this->$method();
		}
	}
}
?>

use_properties.php

<?php
// Require PHP 5.4 or later
require 'trait.properties.php';

class Person {
	use Properties;

	public function __construct($first, $last) {
		$this->properties['firstname'] = $first;
		$this->properties['lastname'] = $last;
	}

	public function get_fullname() {
		echo "Get fullname\n";
		return $this->firstname.' '.$this->lastname;
	}

	public function get_firstname() {
		echo "Get firstname\n";
		return 'F:'.$this->properties['firstname'];
	}

	public function set_firstname($value) {
		echo "Set firstname=$value\n";
		$this->properties['firstname'] = trim($value);
	}

	public function get_lastname() {
		echo "Get lastname\n";
		return 'L:'.$this->properties['lastname'];
	}

	public function set_lastname($value) {
		echo "Set lastname=$value\n";
		$this->properties['lastname'] = trim($value);
	}
}

$person = new Person('John', 'Doe');
echo $person->fullname."\n";

$person->firstname = 'Jens';
$person->lastname = 'Kohl';
echo $person->fullname."\n";

// Output:
//
// Get fullname
// Get firstname
// Get lastname
// F:John L:Doe
// Set firstname=Jens
// Set lastname=Kohl
// Get fullname
// Get firstname
// Get lastname
// F:Jens L:Kohl
?>