PHP 4: static

[nebulom]

I don't know if PHP 4 supports static but I need help on achieving this or workaround on having something like

<?php
class test {
  static $a;
  
  function b() {
    if (!isset(test::$a)) {
      test::$a = "hello world";
    }
    return test::$a;
  }
}

echo test::b();

Thanks.