This can be used for quick and dirty internationalization:

<?php
$GLOBALS['strings']['example'] = "There are %d people.";

// Loads a phrase from the translations list in lang/$lang/phrases.php
function t() {
    $args = func_get_args();
    $nArgs = func_num_args();
    
    $phrase = array_shift($args);
    $nArgs--;
    
    include_once("../lang/" . lang() . "/phrases.php");
    if (isset($GLOBALS['strings'][$phrase])) {
        return vsprintf($GLOBALS['strings'][$phrase], $args);
    } else {
        return '<span style="color: #ff0000">Untranslated string: ' . $phrase . '</span>';
    }
}
?>