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Editorial Team
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Asked: 2026-05-11T23:27:54+00:00

I was going through the list of predefined Exceptions in PHP and I noticed

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I was going through the list of predefined Exceptions in PHP and I noticed the DomainException. Anyone know what does DomainException mean? Does it mean failed data model validation?

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  1. Editorial Team

    There’s a pretty hilarious discussion here about how no one seems to know what is means:

    http://bugs.php.net/bug.php?id=47097

    From the end of that link:

    Domain means data domain here. That is
    a DomainException shall be thrown
    whenever a value does not adhere to a
    defined valid data domain. Examples:

    • 0 is not in the domain for division.
    • Foo is not in the domain for weekdays.

    The first is different from out of
    range and alike, but you could use
    InvalidParameter in case it is
    actually a parameter to the function
    that performs the division. If it is a
    value calculated inside the function
    prior to executing the division and
    then a pre-conditon check throws
    instead of executing the division,
    then it becomes a DomainException.

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