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Editing: Templates.php

<?php
/**
 * Template Action.
 *
 * @package ULTP\Templates
 * @since v.1.0.0
 */

namespace ULTP;

defined( 'ABSPATH' ) || exit;

/**
 * Templates class.
 *
 * Handles template file inclusion and page template registration for Ultimate Post.
 *
 * @package ULTP\Templates
 * @since v.1.0.0
 */
class Templates {

/**
	 * Setup class.
	 *
	 * @since v.1.0.0
	 */
	public function __construct() {
		add_filter( 'template_include', array( $this, 'set_template_callback' ) );
		add_filter( 'theme_page_templates', array( $this, 'add_template_callback' ) );
	}

/**
	 * Include Template File
	 *
	 * @since v.1.0.0
	 * @param STRING $template Template file path.
	 * @return STRING Template file path.
	 */
	public function set_template_callback( $template ) {
		if ( is_singular() ) {
			global $post;
			if ( get_post_meta( $post->ID, '_wp_page_template', true ) === 'ultp_page_template' ) {
				$template = ULTP_PATH . 'classes/template-without-title.php';
			}
		}
		return $template;
	}

/**
	 * Add a page template to the theme.
	 *
	 * @since v.1.0.0
	 * @param ARRAY $templates The page template list.
	 * @return ARRAY
	 */
	public function add_template_callback( $templates ) {
		$templates['ultp_page_template'] = __( 'PostX Template (Without Title)', 'ultimate-post' );
		return $templates;
	}
}