(PHP 5 >= 5.3.0, PHP 7)
ReflectionFunctionAbstract::inNamespace — Checks if function in namespace
public ReflectionFunctionAbstract::inNamespace ( ) : bool
Checks whether a function is defined in a namespace.
This function is currently not documented; only its argument list is available.
This function has no parameters.
true if it's in a namespace, otherwise false
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https://www.php.net/manual/en/reflectionfunctionabstract.innamespace.php