Reading []

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  <?php
 class  XmlTest  {

    function  test_ref (& $test ) {
         $test  =  "ok" ;
    }

    function  test ( $test ) { }

    function  run () {
         $ar  = array();
         $this -> test_ref ( $ar []);
         var_dump ( $ar );
         $this -> test ( $ar []);
    }
}

 $o  = new  XmlTest ();
 $o -> run ();
 ?>

This should always have thrown a fatal E_ERROR , because [] cannot be used for reading in PHP. It is invalid code in PHP 4.4.2 and PHP 5.0.5 upward.