Where's the Monkey - Pointers

<?php
function wheresTheMonkey() {

 //A
 $months = array();
 for ($i=6; $i>=0; $i--) {
     $months[$i]["start"] = mktime(0,0,0, date("m")-(1*$i), 1,  date("Y"));

 }

 print_r($months);

 //B
 foreach ($months as &$month) {
     $month["end"] = strtotime("now +1 month", $month["start"]);
 }

 print_r($months);

 //C
 foreach ($months as $month) {
     printf("%s\t\t%s\n",date("d F y", $month["start"]), $month["start"]);

 }
}

print '<pre>';
wheresTheMonkey();
print '</pre>';

?>

This caused me a headache today - monkey business everywhere. If you don't get the gotcha; $month is still a pointer / reference to an array element in $months, so doing another foreach assigns a new value to $months[0] when you set $month!

It's too easy to forget in PHP...