When this script is run:

<?php
  class Three {
    var $one, $two;

    function Three($a, $b) {
      echo "a is $a; b is $b<br>\n";

      $this->$one = $a;

      echo "one is " . $this->$one . "; two is " . $this->$two . "<br>\n";

      $this->$two = $b;

      echo "one is " . $this->$one . "; two is " . $this->$two . "<br>\n";
    }
  }

  $three = new Three(1, 2);
?>

the results it produces are:

a is 1; b is 2
one is 1; two is 1
one is 2; two is 2

For some reason, it appears as if the two separate variables $one and $two are pointing at the same thing.  This doesn't appear to be a problem that is specific to the constructor, as it happens even if the function involved is only a normal function.  It also occurs if the variables are modified outside of the class.

I also found this bug in 4.0.3pl1, but have not tried any earlier version.  The only module I compiled PHP with was pgsql, if it matters.

Alex Wilkins