(PHP 5 >= 5.5.0, PHP 7)
ReflectionFunctionAbstract::isGenerator — Returns whether this function is a generator
public ReflectionFunctionAbstract::isGenerator ( ) : bool
This function is currently not documented; only its argument list is available.
This function has no parameters.
Returns true if the function is generator, false if it is not or null on failure.
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https://www.php.net/manual/en/reflectionfunctionabstract.isgenerator.php