time since portugues

function time_since($since) {
    $chunks = array(
        array(60 * 60 * 24 * 365 , 'ano'),
        array(60 * 60 * 24 * 30 , 'mes'),
        array(60 * 60 * 24 * 7, 'semana'),
        array(60 * 60 * 24 , 'dia'),
        array(60 * 60 , 'hora'),
        array(60 , 'minuto'),
        array(1 , 'segundo')
    );

    for ($i = 0, $j = count($chunks); $i < $j; $i++) {
        $seconds = $chunks[$i][0];
        $name = $chunks[$i][1];
        if (($count = floor($since / $seconds)) != 0) {
            break;
        }
    }

    $print = ($count == 1) ? '1 '.$name : "$count {$name}s";
    if($print=="$count mess") $print = "$count meses";

    return 'há '.$print;
}

echo time_since(1372440149); // unix timestamp (pode usar strtotime())