Convert Period of Time values (e.g., 1h15m30s) to seconds. Converts all values in stdin and sends to stdout.

convert-hms-to-s.php

#!/usr/bin/php
<?php
$content = trim(file_get_contents('php://stdin', 'r'));
preg_match_all('/\b((?:[\d]+h)?(?:[\d]+m)?(?:[\d]+s))\b/i', $content, $matches, PREG_PATTERN_ORDER);
foreach ($matches[1] as $PTtime) {
    $start = new DateTime();
    $end = clone $start;
    $end->add(new DateInterval(sprintf('PT%s', strtoupper($PTtime))));
    $elapsed = $end->getTimestamp() - $start->getTimestamp();
    $content = preg_replace(sprintf('/\b%s\b/', $PTtime), $elapsed, $content);
}
echo $content;