<?php
$horario = "03:11:48";
$segundos = $partes[0] * 3600 + $partes[1] * 60 + $partes[2];
echo $segundos;
PD9waHAKCiAgICAkaG9yYXJpbyA9ICIwMzoxMTo0OCI7CiAgICAkcGFydGVzID0gZXhwbG9kZSgnOicsICRob3JhcmlvKTsKICAgICRzZWd1bmRvcyA9ICRwYXJ0ZXNbMF0gKiAzNjAwICsgJHBhcnRlc1sxXSAqIDYwICsgJHBhcnRlc1syXTsKICAgIAogICAgZWNobyAkc2VndW5kb3M7