feature.php

<?php
/**
 * Quick proof of concept for feature management
 */
class Feature {

	/**
	 * This is where we keep the list of features
	 */
	protected $features;

	/**
	 * Constructor
	 * 
	 * @param array $features List of supported features
	 */
	public function __construct($features = array()) {
		$this->features = $features;
	}

	public function enable($feature) {
		if (in_array($feature, array_keys($this->features))) {
			$this->features[$feature] = true;
		}
	}

	public function disable($feature) {
		if (in_array($feature, array_keys($this->features))) {
			$this->features[$feature] = false;
		}

	}

	public function status() {
		return $this->features;
	}

	public function isEnabled($feature) {
		$result = false;
		
		if (in_array($feature, array_keys($this->features)) && $this->features[$feature]) {
			$result = true;
		}

		return $result;
	}
}

////////////////////////////////////////

$someFeatures = array(
		'featureA' => true,
		'featureB' => true,
		'featureC' => false,
	);

$feature = new Feature($someFeatures);
$feature->disable('featureA');
$feature->enable('featureC');
print_r($feature->status());
?>