L10n on php + gettext

.htaccess

Options +Includes +FollowSymLinks -Indexes
AddHandler server-parsed .shtml
DirectoryIndex index.php index.html
AddDefaultCharset UTF-8
CookieTracking on
CookieExpires "1 years"

# default php version is 5.x.x
# uncomment next line to use  4.4.9
# AddType application/x-httpd-php44 php

RewriteEngine On
RewriteRule ^en index.php?locale=en_US [L]
RewriteRule ^ru index.php?locale=ru_RU [L]

#php_value error_reporting 7
#php_flag display_errors On

bridges.po

#: footer.php:8 header.php:8
msgid "тарифы"
msgstr "pricing"

#: footer.php:9 header.php:9
msgid "о компании"
msgstr "about"

#: footer.php:10 header.php:6
msgid "сервис и услуги"
msgstr "our services"

#: footer.php:11 header.php:10
msgid "написать нам"
msgstr "contact us"

filetree

/locale/en_US/LC_MESSAGES/bridges.mo
/locale/en_US/LC_MESSAGES/bridges.po

functions.php

<?
$locale=$_GET["locale"];
if(!isset($locale)) {
	$locale="ru_RU";
}
putenv("LC_ALL=$locale");
setlocale(LC_ALL, $locale);
$domain='bridges';
bindtextdomain($domain, './locale');
textdomain($domain);

function __($string){
	echo gettext($string);
}
?>

sample.php

<nav id="nav">
	<ul>
		<li class="section-link"><a href="#"><? __('сервис и услуги') ?></a>
		</li>
		<li class="section-link"><a href="#"><? __('тарифы') ?></a></li>
		<li class="section-link"><a href="#"><? __('о компании') ?></a></li>
		<li><a href="mailto:bridgesvl@mail.ru"><? __('написать нам') ?></a>
		</li>
	</ul>
</nav>

switcher.php

<?
$locales_ui=array(
	"ru"=>array(
		'link'=>'ru',
		'id'=>"ru_RU",
		'label'=>'Переключиться на русский',
		'image'=>'flag-ru@2x.png'
	),
	"en"=>array(
		'link'=>'en',
		'id'=>"en_US",
		'label'=>'Switch to engligh',
		'image'=>'flag-en@2x.png'
	)
);
foreach($locales_ui as $key=>$language){
	$name=$key;
	$href=$language['link'];
	$class=array('locale-item');
	if($locale==$language['id']){
		array_push($class, 'active');
	}
	$class=implode(' ', $class);
	?>
	<a
		href="<?= $href ?>"
		class="<?= $class ?>"
	>
		<img
			src="images/<?= $language['image'] ?>"
			class="locale-item-icon"
		>
	</a>
	<?
}
?>