lateStaticBinding.php

<?php

class foo
{
  public static function hello()
  {
    echo "Hello ";
  }
  
  public static function world()
  {
    echo "World ";
  }
  
  public static function sayHelloWorld()
  {
    static::hello();
    self::world();
    echo "\n";
  }
}

class bar extends foo
{
  public static function hello()
  {
    echo "Bonjours ";
  }
  
  public static function world()
  {
    echo "Monde ";
  }
  
   public static function sayHelloWorld()
  {
    static::hello();
    self::world();
    echo "\n";
  }
}

foo::sayHelloWorld();
bar::sayHelloWorld();