ext.php

<?php
/**
*
* @package Auto db Backup
* @copyright (c) 2015 david63
* @license GNU General Public License, version 2 (GPL-2.0)
*
*/

namespace david63\autodbbackup;

use phpbb\extension\base;

class ext extends base
{
	/** @var Extension name */
	protected $ext_name = 'autodbbackup';

	/** @var max phpBB version */
	protected $max_version = '4.0.0@dev';

	/** @var min phpBB version */
	protected $min_version = '3.3.0';

	/** @var PHP version */
	protected $php_version = '7.1.3';

	/** @var phpBB check version */
	protected $phpbb_version = '3.3.0';

	/**
	* Enable extension if requirements are met
	*
	* @return bool True if can be enabled, False if not, or an error message in phpBB 3.3.
	* @access public
	*/
	public function is_enableable()
	{
		// Check for PHP version
		if (phpbb_version_compare(PHP_VERSION, $this->php_version, '<'))
		{
			if (phpbb_version_compare(PHPBB_VERSION, $this->phpbb_version, '>='))
			{
				$language = $this->container->get('language');
				$language->add_lang('ext_enable_error', 'david63/'. $this->ext_name);

				return $language->lang('EXT_PHP_ERROR', $this->php_version, PHP_VERSION);
			}
			else
			{
				return false;
			}
		}

		// Check for phpBB version
		if (!(phpbb_version_compare(PHPBB_VERSION, $this->min_version, '>=') && phpbb_version_compare(PHPBB_VERSION, $this->max_version, '<')))
		{
			if (phpbb_version_compare(PHPBB_VERSION, $this->phpbb_version, '>='))
			{
				$config		= $this->container->get('config');
				$language	= $this->container->get('language');
				$language->add_lang('ext_enable_error', 'david63/'. $this->ext_name);

				return $language->lang('EXT_ENABLE_ERROR', $this->min_version, $this->max_version, $config['version']);
			}
			else
			{
				return false;
			}
		}

		return true;
	}
}