(PHP 5 >= 5.4.6, PHP 7)
ReflectionParameter::isDefaultValueConstant — Returns whether the default value of this parameter is a constant
public ReflectionParameter::isDefaultValueConstant ( ) : bool
Returns whether the default value of this parameter is a constant.
This function has no parameters.
Returns true if the default value is constant, and false otherwise.
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https://www.php.net/manual/en/reflectionparameter.isdefaultvalueconstant.php