(PHP 5 >= 5.2.0, PHP 7)
ReflectionFunctionAbstract::isUserDefined — Checks if user defined
public ReflectionFunctionAbstract::isUserDefined ( ) : bool
Checks whether the function is user-defined, as opposed to internal.
This function is currently not documented; only its argument list is available.
This function has no parameters.
true if it's user-defined, otherwise false;
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https://www.php.net/manual/en/reflectionfunctionabstract.isuserdefined.php