example-php-class-instance.php

<?php
/**
 * Register assets
 *
 * @package Example_Plugin
 * @author codetot
 * @since 0.0.1
 */

class Example_Assets {
	/**
	 * Singleton instance
	 *
	 * @var Example_Assets
	 */
	private static $instance;

	/**
	 * Get singleton instance.
	 *
	 * @return Example_Assets
	 */
	public final static function instance()
	{
		if (is_null(self::$instance)) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	public function __construct() {
		add_action( 'wp_enqueue_scripts', array( $this, 'frontend_assets' ) );
	}

	/**
	 * Enqueue frontend assets
	 *
	 * @return void
	 */
	public function frontend_assets() {}
}