Number of seconds -> neatly formatted duration

gistfile1.php

<?php

/**
 * Parse a number of seconds into a more readable format.
 *
 * @param int $seconds          Length of time.
 * @param string $minSeparator  Placed between min and second values.
 * @param string $hourSeparator Placed between hour and minute values.
 * @return string
 */
public static function duration($seconds, $minSeparator = ':', $hourSeparator = ':')
{
    // Work out chunks
    $seconds = (int)$seconds;
    $hours = intval($seconds / 3600);
    $minutes = intval(($seconds / 60) % 60);
    $seconds = str_pad(intval($seconds % 60), 2, '0', STR_PAD_LEFT);

    // Combine with separator
    $duration = $minutes . $minSeparator . $seconds;
    if($hours != 0) {
        $duration = $hours . $hourSeparator . $duration;
    }

    return $duration;
}

?>