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