If after PHP upgrade you're getting error "PHP Fatal error: Cannot declare class error, because the name is already in use ...", you will have to rename your "error" class.
Since PHP 7 classname "Error" is predefined and used internally.
(PHP 7)
Error is the base class for all internal PHP errors.
The error message
The error code
The filename where the error happened
The line where the error happened
If after PHP upgrade you're getting error "PHP Fatal error: Cannot declare class error, because the name is already in use ...", you will have to rename your "error" class.
Since PHP 7 classname "Error" is predefined and used internally.
Lists of Throwable and Exception tree as of 7.2.0
Error
ArithmeticError
DivisionByZeroError
AssertionError
ParseError
TypeError
ArgumentCountError
Exception
ClosedGeneratorException
DOMException
ErrorException
IntlException
LogicException
BadFunctionCallException
BadMethodCallException
DomainException
InvalidArgumentException
LengthException
OutOfRangeException
PharException
ReflectionException
RuntimeException
OutOfBoundsException
OverflowException
PDOException
RangeException
UnderflowException
UnexpectedValueException
SodiumException
Find the script and output in the following links:
https://gist.github.com/mlocati/249f07b074a0de339d4d1ca980848e6a
https://3v4l.org/sDMsv
posted here http://php.net/manual/en/class.throwable.php