Convert datetime to human readable representation (polish version).

readable_time.php

<?php 
/**
 * Convert datetime to human readable representation.
 * Polish version. 
 * 
 * @link http://stackoverflow.com/questions/1416697/converting-timestamp-to-time-ago-in-php-e-g-1-day-ago-2-days-ago
 */
function time_elapsed_string_pl($datetime, $full = false) {
    $now = new DateTime;
    $ago = new DateTime($datetime);
    $diff = $now->diff($ago);

    $diff->w = floor($diff->d / 7);
    $diff->d -= $diff->w * 7;

    $string = array(
        'y' => array( 'rok', 'lata', 'lat' ),
        'm' => array( 'miesiąc', 'miesiące', 'miesięcy' ),
        'w' => array( 'tydzień', 'tygodnie', 'tygodni' ),
        'd' => array( 'dzień', 'dni' ),
        'h' => array( 'godzina', 'godziny', 'godzin' ),
        'i' => array( 'minuta', 'minuty', 'minut' ),
        's' => array( 'sekunda', 'sekundy', 'sekund' ),
    );
    foreach ($string as $k => &$v) {
        if ($diff->$k) {
            if( $k !== 'd' ) {
                if( $diff->$k == 1 ) {
                    $v = $diff->$k . ' ' . $v[0];
                } else {
                    $last_digit = intval( substr( $diff->$k, -1 ) );
                    
                    if( $last_digit == 2 ||  $last_digit == 3 ||  $last_digit == 4 ) {
                        $v = $diff->$k . ' ' . $v[1];
                    } else {
                        $v = $diff->$k . ' ' . $v[2];
                    }
                }
                
            } else {
                $v = $diff->$k . ' ' . ($diff->$k > 1 ? $v[1] : $v[0]);
            }
            
        } else {
            unset($string[$k]);
        }
    }

    if (!$full) $string = array_slice($string, 0, 1);
    return $string ? implode(', ', $string) . ' temu' : 'przed chwilą';
}
?>

For example it retruns "2 lata temu" for 2012-12-08 14:20:13.