src/Debug/AbstractObject.php
private function propOverrides(\ReflectionProperty $reflectionProperty, $propInfo, $className)
    {
        if (empty($propInfo['overrides'])
            && empty($propInfo['inheritedFrom'])
            && $reflectionProperty->getDeclaringClass()->getName() == $className
        ) {
            return $className;
        }
        return null;
    }
private function propOverrides(\ReflectionProperty $reflectionProperty, $propInfo, $className)
    {
        if (empty($propInfo['overrides'])
            && empty($propInfo['inheritedFrom'])
            && $reflectionProperty->getDeclaringClass()->getName() == $className
        ) {
            return $className;
        }
        return null;
    }
Determine propInfo['overrides'] value

This is the classname of previous ancestor where property is defined

@param \ReflectionProperty $reflectionProperty Reflection Property
@param array               $propInfo           Property Info
@param string              $className          className of object being inspected

@return string|null