DataTables.php

<?php

/**
 * DataTables PHP libraries.
 *
 * PHP libraries for DataTables and DataTables Editor.
 *
 * @author    SpryMedia Ltd
 * @copyright SpryMedia Ltd
 * @license   MIT
 *
 * @see       https://datatables.net/manual/server/php
 */
define('DATATABLES', true);

//
// Error checking - check that we are PHP 5.4 or newer
//
if (version_compare(\PHP_VERSION, '5.4.0', '<')) {
	echo json_encode([
		'sError' => 'Editor PHP libraries required PHP 5.4 or newer. You are '
			. 'currently using ' . \PHP_VERSION . '. PHP 5.4 and newer have a lot of '
			. 'great new features that the Editor libraries take advantage of to '
			. 'present an easy to use and flexible API.',
	]);

	exit(1);
}

//
// Load the DataTables bootstrap core file and let it register the required
// handlers.
//
require __DIR__ . '/Bootstrap.php';