1--TEST--
2DateTimeImmutable::modify() with invalid format
3--FILE--
4<?php
5
6$datetime = new DateTimeImmutable;
7var_dump($datetime->modify(''));
8
9?>
10--EXPECTF--
11Warning: DateTimeImmutable::modify(): Failed to parse time string () at position 0 ( in %s on line %d
12bool(false)
13
