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Filename : ____functions.php
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<?php

/**
 *
 * This program is a free software; you can use it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

if (!defined('CZR_MIN_PHP_VERSION')) define('CZR_MIN_PHP_VERSION', 5.3);
if (!defined('CZR_MIN_WP_VERSION')) define('CZR_MIN_WP_VERSION', 4.5);

if (version_compare(phpversion(), CZR_MIN_PHP_VERSION, '<')) {
	add_action('admin_notices', 'czr_fn_display_min_php_message');
	return;
}
global $wp_version;
if (version_compare($wp_version, CZR_MIN_WP_VERSION, '<')) {
	add_action('admin_notices', 'czr_fn_display_min_wp_message');
	return;
}

function czr_fn_display_min_php_message()
{
	czr_fn_display_min_requirement_notice(__('PHP', 'customizr'), CZR_MIN_PHP_VERSION);
}

function czr_fn_display_min_wp_message()
{
	czr_fn_display_min_requirement_notice(__('WordPress', 'customizr'), CZR_MIN_WP_VERSION);
}


function czr_fn_display_min_requirement_notice($requires_what, $requires_what_version)
{
	$theme = wp_get_theme()->Name;
	printf(
		'<div class="error"><p>%1$s</p></div>',
		sprintf(
			__('The <strong>%1$s</strong> theme requires at least %2$s version %3$s', 'customizr'),
			$theme,
			$requires_what,
			$requires_what_version
		)
	);
}

/**
 * This is where Customizr starts. This file defines and loads the theme's components :
 * => Constants : CUSTOMIZR_VER, TC_BASE, TC_BASE_CHILD, TC_BASE_URL, TC_BASE_URL_CHILD, THEMENAME, CZR_WEBSITE
 * => Default filtered values : images sizes, skins, featured pages, social networks, widgets, post list layout
 * => Text Domain
 * => Theme supports : editor style, automatic-feed-links, post formats, navigation menu, post-thumbnails, retina support
 * => Plugins compatibility : JetPack, bbPress, qTranslate, WooCommerce and more to come
 * => Default filtered options for the customizer
 * => Customizr theme's hooks API : front end components are rendered with action and filter hooks
 *
 * The method CZR__::czr_fn__() loads the php files and instantiates all theme's classes.
 * All classes files (except the class__.php file which loads the other) are named with the following convention : class-[group]-[class_name].php
 *
 * The theme is entirely built on an extensible filter and action hooks API, which makes customizations easy and safe, without ever needing to modify the core structure.
 * Customizr's code acts like a collection of plugins that can be enabled, disabled or extended.
 *
 * If you're not familiar with the WordPress hooks concept, you might want to read those guides :
 * http://docs.presscustomizr.com/article/26-wordpress-actions-filters-and-hooks-a-guide-for-non-developers
 * https://codex.wordpress.org/Plugin_API
 */

//Fire Customizr
require_once(get_template_directory() . '/core/init-base.php');


/**
 * THE BEST AND SAFEST WAY TO EXTEND THE CUSTOMIZR THEME WITH YOUR OWN CUSTOM CODE IS TO CREATE A CHILD THEME.
 * You can add code here but it will be lost on upgrade. If you use a child theme, you are safe!
 *
 * Don't know what a child theme is ? Then you really want to spend 5 minutes learning how to use child themes in WordPress, you won't regret it :) !
 * https://codex.wordpress.org/Child_Themes
 *
 * More informations about how to create a child theme with Customizr : http://docs.presscustomizr.com/article/24-creating-a-child-theme-for-customizr/
 * A good starting point to customize the Customizr theme : http://docs.presscustomizr.com/article/35-how-to-customize-the-customizr-wordpress-theme/
 */

// jako shordcode : [custom_translate text="Tekst do przetłumaczenia"]
function custom_translate($text)
{
	// tablica wszystkich własnych tłumaczeń
	$translations = [
		// tekst źródłowy => [kod_języka => tłumaczenie]
		'Instytut Ogrodnictwa – Państwowy Instytut Badawczy' => [
			'pl' => 'Instytut Ogrodnictwa – Państwowy Instytut Badawczy',
			'en' => 'The National Institute of Horticultural Research'
		],
		'Instytut Ogrodnictwa – PIB' => [
			'pl' => 'Instytut Ogrodnictwa – PIB',
			'en' => 'The National Institute of Horticultural Research'
		]
	];

	// domyślny język
	$lang = 'pl';

	// wykrycie języka z cookie GTranslate
	if (isset($_COOKIE['googtrans'])) {
		$parts = explode('/', $_COOKIE['googtrans']);
		if (!empty($parts[2])) $lang = $parts[2];
	}

	// wykrycie języka z URL np. /wordpress/en/
	if (isset($_SERVER['REQUEST_URI'])) {
		if (preg_match('#/en(/|$)#', $_SERVER['REQUEST_URI'])) $lang = 'en';
	}

	// zwracamy tłumaczenie jeśli istnieje, inaczej oryginał
	return $translations[$text][$lang] ?? $text;
}

function custom_translate_shortcode($atts)
{
	$atts = shortcode_atts([
		'text' => ''
	], $atts);

	return custom_translate($atts['text']);
}
add_shortcode('custom_translate', 'custom_translate_shortcode');