eth-escape-headspace.php

<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
/**
  Plugin Name: ETH Escape HeadSpace2
  Plugin URI: https://ethitter.com/plugins/
  Description: Output existing HeadSpace2 data without the original plugin. Allows HeadSpace2 (no longer maintained) to be deactivated without impactacting legacy content.
  Author: Erick Hitter
  Version: 0.2.1
  Author URI: https://ethitter.com/

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/**
 * Class ETH_Escape_HeadSpace2.
 */
class ETH_Escape_HeadSpace2 {
	/**
	 * Singleton
	 *
	 * @var self
	 */
	private static $instance = null;

	/**
	 * Instantiate singleton
	 */
	public static function get_instance() {
		if ( ! is_a( self::$instance, __CLASS__ ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Headspace's string keys.
	 *
	 * @var array
	 */
	private $hs_string_keys = array(
		'_headspace_description',
		'_headspace_metakey',
		'_headspace_raw',
	);

	/**
	 * Headspace's array keys.
	 *
	 * @var array
	 */
	private $hs_array_keys = array(
		'_headspace_scripts',
		'_headspace_stylesheets',
	);

	/**
	 * Headspace's robots.txt keys.
	 *