Twig-translate-function.xgettext.php

<?php
/**
 * Twig-translate-function.php
 *
 * @link  https://twig.symfony.com/doc/1.x/advanced.html#filters
 */

$twig = new Twig_Environment($loader);
$twig->addFunction(new \Twig_SimpleFunction('translate', function ($str) {
    return gettext( $str );
}));

?>


#
#: example.twig
#

{# <?php fake php #}

{# Trans: Was: 'Assignments' #}
<p>{{ translate('My assignments') }}</p>


#
#: bash
#

xgettext --default-domain=messages -p ./lang -L PHP --keyword=translate -cTrans: --force-po templates/*/*.twig

# End.