(PHP 5 >= 5.1.2, PHP 7)
ReflectionClass::getStaticPropertyValue — Gets static property value
public ReflectionClass::getStaticPropertyValue ( string $name [, mixed &$def_value ] ) : mixed
Gets the value of a static property on this class.
name
The name of the static property for which to return a value.
def_value
 A default value to return in case the class does not declare a static property with the given name. If the property does not exist and this argument is omitted, a ReflectionException is thrown. 
The value of the static property.
Example #1 Basic usage of ReflectionClass::getStaticPropertyValue()
<?php
class Apple {
    public static $color = 'Red';
}
$class = new ReflectionClass('Apple');
var_dump($class->getStaticPropertyValue('color'));
?> The above example will output:
string(3) "Red"
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    https://www.php.net/manual/en/reflectionclass.getstaticpropertyvalue.php