i18n.php

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<?php
bindtextdomain('default', APP_PATH . 'locale/');
textdomain('default');

class I18n
{

    public static function get($sentence)
    {
        $sentence = gettext($sentence);

        if (func_num_args() > 1) {
            $args = func_get_args();
            unset($args[0]);
            $sentence = vsprintf($sentence, $args);
        }

        return $sentence;
    }

    public static function nget($sentence1, $sentence2, $n)
    {
        $sentence = ngettext($sentence1, $sentence2, $n);

        if (func_num_args() > 3) {
            $args = func_get_args();
            unset($args[0], $args[1], $args[2]);
            $sentence = vsprintf($sentence, $args);
        }

        return $sentence;
    }

    public static function cget($sentence, $category)
    {
        $sentence = dcgettext(textdomain(null), $sentence, $category);

        if (func_num_args() > 2) {
            $args = func_get_args();
            unset($args[0], $args[1]);
            $sentence = vsprintf($sentence, $args);
        }

        return $sentence;
    }

    public function cnget($sentence1, $sentence2, $n, $category)
    {
        $sentence = dcngettext(textdomain(null), $sentence1, $sentence2, $n, $category);

        if (func_num_args() > 4) {
            $args = func_get_args();
            unset($args[0], $args[1], $args[2], $args[3]);
            $sentence = vsprintf($sentence, $args);
        }

        return $sentence;
    }

}