runtime access to static variable

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How do I access a static variable when I do not know the name of the
class until runtime?

I have the following example PHP:

ket% cat test.php 
<?php

class Test
{
  public static
    $STEPS = array(
      'foo',
      'bar');
}

$className = 'Test';

var_dump($className::$STEPS);
ket% 

Unfortunately when I run it I get:

ket% php test.php 

Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM
in /home/jablko/trash/test.php on line 13
ket% 

I can call a static function using call_user_func(array($className,
'functionName')), and I can access a class constant using
constant($className.'::CONSTANT_NAME'). How do I access a static
variable?


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