init_header.php

<?php
/**
 * The MIT License (MIT).
 *
 * Copyright (c) 2013 Jonathan Vollebregt (jnvsor@gmail.com), Rokas Šleinius (raveren@gmail.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
if (defined('KINT_DIR')) {
    return;
}

if (version_compare(PHP_VERSION, '5.1.2') < 0) {
    throw new Exception('Kint 2.0 requires PHP 5.1.2 or higher');
}

define('KINT_DIR', dirname(__FILE__));
define('KINT_WIN', DIRECTORY_SEPARATOR !== '/');
define('KINT_PHP52', (version_compare(PHP_VERSION, '5.2') >= 0));
define('KINT_PHP522', (version_compare(PHP_VERSION, '5.2.2') >= 0));
define('KINT_PHP523', (version_compare(PHP_VERSION, '5.2.3') >= 0));
define('KINT_PHP524', (version_compare(PHP_VERSION, '5.2.4') >= 0));
define('KINT_PHP525', (version_compare(PHP_VERSION, '5.2.5') >= 0));
define('KINT_PHP53', (version_compare(PHP_VERSION, '5.3') >= 0));
define('KINT_PHP56', (version_compare(PHP_VERSION, '5.6') >= 0));
define('KINT_PHP70', (version_compare(PHP_VERSION, '7.0') >= 0));
define('KINT_PHP72', (version_compare(PHP_VERSION, '7.2') >= 0));