Time Spec

time.php

<?php
/**
 * Translate a clock formatted string into a sum of seconds
 * e.g. toSec("3:20") == 200
 */
function toSec($clock) {
    $eq = array(1, 60, 3600, 86400);
    $seconds = 0;
    $parts = explode(':', $clock, count($eq));
    $parts = array_reverse($parts);
    foreach($parts as $i => $part) {
        $seconds += $part * $eq[$i];
    }
    return $seconds;
}

/**
 * Translate a sum of seconds into clock format (opposite of toSec)
 * e.g. toClock(200) == "3:20"
 */
function toClock($seconds) {
    $m = array('d' => 86400, 'h' => 3600, 'm' => 60, 's' => 1);
    $p = array('d' => 0, 'h' => 0, 'm' => 0, 's' => 0);
    foreach($m as $i => $d) {
        $s = floor($seconds / $d);
        $seconds -= $s * $d;
        $p[$i] = (($i == 'h' && $p['d'] == '00') || $i == 'd') ? $s : sprintf('%02d', $s);
    }
    if ($p['d'] == "00") {
        unset($p['d']);
    }
    if (empty($p['h'])) {
        unset($p['h']);
    }
    $e = array_shift($p);
    if (strlen($e) > 1 && $e[0] == 0) {
        $e = substr($e, 1);
    }
    array_unshift($p, $e);
    return implode(':', $p);
}