<?php
$arr = preg_split("/([0-9]{2}:[0-9]{2})/", "asdf06:20Programold07:20Programnew", -1, PREG_SPLIT_DELIM_CAPTURE
);
?>
PD9waHAKCiRhcnIgPSBwcmVnX3NwbGl0KCIvKFswLTldezJ9OlswLTldezJ9KS8iLCAiYXNkZjA2OjIwUHJvZ3JhbW9sZDA3OjIwUHJvZ3JhbW5ldyIsIC0xLCBQUkVHX1NQTElUX0RFTElNX0NBUFRVUkUpOwpwcmludF9yKCRhcnIpOwoKPz4=