Description:
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From manual page: http://www.php.net/dateperiod.construct
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As the supplied code snippet works without errors I'd suggest the method signature for the DatePeriod constructor is actually (since v5.5):

public DatePeriod::__construct ( DateTimeInterface $start , DateInterval $interval , int $recurrences [, int $options ] )
public DatePeriod::__construct ( DateTimeInterface $start , DateInterval $interval , DateTimeInterface $end [, int $options ] )
public DatePeriod::__construct ( string $isostr [, int $options ] )

Test script:
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new DatePeriod(new DateTimeImmutable('2015-01-01'), new DateInterval('P1D'), 0);
new DatePeriod(new DateTimeImmutable('2015-01-01'), new DateInterval('P1D'), new DateTimeImmutable('2015-01-02'));


Expected result:
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An error would be expected if the manual was correct.

Actual result:
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No error - DatePeriod object is created.