- var_dump: documentation ( source)
- serialize: documentation ( source)
<?php
$dt = new DateInterval('P1D');
var_dump($dt);
echo "\n\n-------------\n\n";
$st = serialize($dt);
echo "\n\n-------------\n\n";
var_dump($st);
echo "\n\n-------------\n\n";
var_dump($dt->days);
?>