(PHP 5 >= 5.0.3, PHP 7)
ReflectionParameter::isDefaultValueAvailable — Checks if a default value is available
public ReflectionParameter::isDefaultValueAvailable ( ) : bool
Checks if a default value for the parameter is available.
This function has no parameters.
true if a default value is available, otherwise false
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https://www.php.net/manual/en/reflectionparameter.isdefaultvalueavailable.php