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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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Exception thrown if a value does not adhere to a defined valid data domain.
The throw keyword is used to throw exceptions. Exceptions are a way to change the program flow if an unexpected situation arises, such as invalid data. The try... catch... finally structure can be used to handle exceptions.
The thrown object must be an instance of the Exception class or a subclass of Exception. Trying to throw an object that is not will result in a PHP Fatal Error.
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
DomainExceptionshall 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
InvalidParameterin 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 aDomainException.
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