Script set.php3:

<?
 class x {
  var $a=2;
  function seta ($b) {
        $this->a = $b;
        echo "$b\n";
  }
}

$y = new x();
echo $y->a,"\n";

$y->seta(10);
echo $y->a,"\n";
?>

Run: php -f set.php3
get:
2
10
10 

still OK. Now run php -a < set.php3:
Interactive mode enabled

Content-Type: text/html

2
2


Huh? where's my method call? Or interactive mode isn't what I thought it is?

Strange thing is that php < set.php3 does work, so what "interactive mode" is in fact?