About constant overrides and Late Static Binding

constants.php

<?php

class A {

  const C = 'Class A';

  public static function constantSelf() {
    print self::C . PHP_EOL;
  }

  public static function constantStatic() {
    print static::C . PHP_EOL;
  }

}

class B extends A {

  const C = 'Class B';

}

print A::constantSelf();
print B::constantSelf();

print A::constantStatic();
print B::constantStatic();

results.txt

>$ php constants.php
Class A
Class A
Class A
Class B