(PHP 5 >= 5.3.0, PHP 7, PHP 8)
ReflectionFunctionAbstract::inNamespace — Checks if function in namespace
public ReflectionFunctionAbstract::inNamespace(): bool
Checks whether a function is defined in a namespace.
This function has no parameters.
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https://www.php.net/manual/en/reflectionfunctionabstract.innamespace.php