symfony-form-config4.php

Using a static OptionSupport class that automatically writes options into properties AND fields extend it.

+ Options are set in the very beginning of the constructor
+ Concise
+ Error if option is not supported
+ Everything is a property, no special treatment of options
+ Good performance
+ Static options can be hidden from public access

- Private properties wouldn't work, access not allowed from parent classes.

<?php

class Thing extends OptionSupport
{
    protected static $options = array('required');

    protected static $requiredOptions = array('required');

    protected $required = false; // default value is false

    public function __construct(array $options = array())
    {
        self::initialize($this, $options);
    }

    public function getRequired() { return $this->required; }
}

class OptionSupport
{
    static public function initialize($obj, $options)
    {
        // validate here and such

        foreach ($options AS $k => $v) {
            $obj->$k = $v;
        }
    }
}

// Ugly: You have to respell all the previous options

class OtherThing extends Thing
{
    public static $options = array('required', 'newoption');

    public static $requiredOptions = array('required', 'newoption');

    protected $newoptions;

    public function getNewOptions()
    {
        return $this->newoptions;
    }
}

$o = new OtherThing(array('required' => true, 'newoptions' => 'asdf'));

echo "NewOptions: " . $o->getNewOptions() . "\n";
echo "REquired: " . $o->getRequired() . "\n";