(PHP 5, PHP 7)
ReflectionClass::isUserDefined — Checks if user defined
public ReflectionClass::isUserDefined ( ) : bool
Checks whether the class is user-defined, as opposed to internal.
This function has no parameters.
Returns true
on success or false
on failure.
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https://www.php.net/manual/en/reflectionclass.isuserdefined.php