- var_dump: documentation ( source)
- preg_match: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$string = '+6 year +1 month';
preg_match('/\+(\d+)\smonth/', $string, $monthMatch);
preg_match('/\+(\d+)\syear/', $string, $yearMatch);
$monthInterval = isset($monthMatch[1]) ? (int)$monthMatch[1] : 0;
$yearInterval = isset($yearMatch[1]) ? (int)$yearMatch[1] : 0;
var_dump(date('Y-n-j', strtotime('+1 year +6 month')));
var_dump(date('Y-n-j', strtotime('+6 month +1 year')));
?>