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Edit File: head-footer-code.php

<?php
/**
 * Head & Footer Code plugin for WordPress
 *
 * @link https://urosevic.net/
 * @link https://www.techwebux.com/
 * @since 1.0.0
 * @package Head_Footer_Code
 *
 * Plugin Name: Head & Footer Code
 * Plugin URI: https://urosevic.net/wordpress/plugins/head-footer-code/
 * Description: Easy add site-wide, category or article specific custom code before the closing &lt;/head&gt; and &lt;/body&gt; or after opening &lt;body&gt; HTML tag.
 * Version: 1.4.2
 * Author: Aleksandar Urošević
 * Author URI: https://urosevic.net/
 * License: GPLv3
 * License URI: https://www.gnu.org/licenses/gpl-3.0.txt
 * Text Domain: head-footer-code
 * Domain Path: /languages
 * Requires at least: 4.9
 * Tested up to: 6.8
 * Requires PHP: 5.5
 */

namespace Techwebux\Hfc;

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

define( 'HFC_VER', '1.4.2' );
define( 'HFC_VER_DB', '9' );
define( 'HFC_FILE', __FILE__ );
define( 'HFC_DIR', __DIR__ );
define( 'HFC_URL', plugin_dir_url( __FILE__ ) );
define( 'HFC_PLUGIN_NAME', 'Head & Footer Code' );
define( 'HFC_PLUGIN_SLUG', 'head-footer-code' );

// Load files.
require_once HFC_DIR . '/classes/autoload.php';
new Main();

/**
 * Add `wp_body_open` backward compatibility for WordPress installations prior 5.2
 */
if ( ! function_exists( 'wp_body_open' ) ) {
	/**
	 * Fire the wp_body_open action.
	 */
	function wp_body_open() {
		do_action( 'wp_body_open' );
	}
}