- var_dump: documentation ( source)
- date_parse_from_format: documentation ( source)
<?php
var_dump(date_parse_from_format('d/m/Y', '01/01/1990'));
var_dump(date_parse_from_format('d/m/Y', '01/01/990'));
var_dump(date_parse_from_format('d/m/Y', '01/01/90'));