PHP 5.3 object passing

gistfile1.aw

<?php

function pass_by_pointer($obj = NULL) {
  $obj->value = 5;
}

function pass_by_reference(&$obj = NULL) {
  $obj->value = 4;
}

$obj = NULL;
pass_by_pointer($obj);
print_r('pass_by_pointer(NULL):' . "\n");
var_dump($obj);

$obj = NULL;
pass_by_reference($obj);
print_r('pass_by_reference(NULL):' . "\n");
var_dump($obj);

$obj = new stdClass();
pass_by_pointer($obj);
print_r('pass_by_pointer($obj):' . "\n");
var_dump($obj);

$obj = new stdClass();
pass_by_reference($obj);
print_r('pass_by_reference($obj):' . "\n");
var_dump($obj);