(PHP 5 >= 5.2.0, PHP 7, PHP 8)
ReflectionFunctionAbstract::isInternal — Checks if is internal
public ReflectionFunctionAbstract::isInternal(): bool
Checks whether the function is internal, as opposed to user-defined.
This function has no parameters.
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https://www.php.net/manual/en/reflectionfunctionabstract.isinternal.php