podlove.php

<?php
/**
 * Plugin Name: Podlove Podcast Publisher
 * Plugin URI:  http://publisher.podlove.org
 * Description: The one and only next generation podcast publishing system. Seriously. It's magical and sparkles a lot.
 * Version:     2.11.4
 * Author:      Podlove
 * Author URI:  http://podlove.org
 * License:     MIT
 * License URI: license.txt
 * Text Domain: podlove-podcasting-plugin-for-wordpress
 */

function load_podlove_podcast_publisher()
{
    require_once __DIR__ . '/vendor/autoload.php'; # composer autoloader
    require_once __DIR__ . '/bootstrap/bootstrap.php';
    require_once __DIR__ . '/lib/helper.php';
    require_once __DIR__ . '/lib/cron.php';
    require_once __DIR__ . '/lib/network.php';
    require_once __DIR__ . '/lib/php/array.php';
    require_once __DIR__ . '/lib/php/string.php';
    require_once __DIR__ . '/lib/version.php';
    require_once __DIR__ . '/lib/feeds.php';
    require_once __DIR__ . '/lib/shortcodes.php';
    require_once __DIR__ . '/plugin.php';
}

function podlove_admin_error_no_autoload()
{
    ?>
	<div id="message" class="error">
		<p>
			<strong>Podlove Podcast Publisher could not be activated</strong>
		</p>
		<p>
			Plugin files are incomplete. Please download a fresh copy of the plugin: <a href="https://downloads.wordpress.org/plugin/podlove-podcasting-plugin-for-wordpress.zip">downloads.wordpress.org/plugin/podlove-podcasting-plugin-for-wordpress.zip</a> and <a href="https://codex.wordpress.org/Managing_Plugins#Installing_Plugins">repeat the installation</a>.
		</p>
	</div>
	<?php
}

function podlove_admin_error_ancient_php()
{
    ?>
	<div id="message" class="error">
		<p>
			<strong>Podlove Podcast Publisher could not be activated</strong>
		</p>
		<p>
			Podlove Podcasting Plugin requires <code>PHP 5.4</code> or higher.<br>
			You are running <code>PHP <?php echo phpversion(); ?></code>.<br>
			Please ask your hoster how to upgrade to an up-to-date PHP version.
		</p>
		<p>
			If you need to go back to an older Publisher version,
			you can find a list of all available downloads at
			<a href="https://wordpress.org/plugins/podlove-podcasting-plugin-for-wordpress/developers/">wordpress.org/plugins/podlove-podcasting-plugin-for-wordpress/developers/</a>.
		</p>
	</div>
	<?php
}

function podlove_deactivate_plugin()
{
    add_action('admin_init', function () {
        deactivate_plugins(plugin_basename(__FILE__));
    });
}

$correct_php_version = version_compare(phpversion(), "5.4", ">=");

if (!$correct_php_version) {
    // Let the plugin update/setup succeed and constantly show the error
    // message until resolved.
    add_action('admin_notices', 'podlove_admin_error_ancient_php');
    podlove_deactivate_plugin();
} else if (!file_exists(trailingslashit(dirname(__FILE__)) . 'vendor/autoload.php')) {
    // Looks like this can happen on cheap shared hosting. Update fails and leaves
    // the Publisher in an unusable state. From experience it's always at least
    // 'vendor/autoload.php' that is missing. This also catches users that accidentally
    // download the development version from GitHub.
    add_action('admin_notices', 'podlove_admin_error_no_autoload');
    podlove_deactivate_plugin();
} else {
    load_podlove_podcast_publisher();
}