(PHP 5, PHP 7)
ReflectionParameter::isPassedByReference — Checks if passed by reference
public ReflectionParameter::isPassedByReference ( ) : bool
Checks if the parameter is passed in by reference.
This function is currently not documented; only its argument list is available.
This function has no parameters.
true if the parameter is passed in by reference, otherwise false
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https://www.php.net/manual/en/reflectionparameter.ispassedbyreference.php