Description:
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when I declare array and make foreach 

step 1: foreach ($list as &$rec) {

then make

step 2: foreach ($list as $rec) {

and last element of $list at the moment "step 1" will broken after executing of "step 2" with data of last element of $list at the moment "step 2"

ps: checked under different versions including 5.2.17

when you make unset($rec) before calling "step 2" bug will not appear.

Test script:
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$list = array(1, 2, 3, 4, 5);
foreach($list as &$rec);
echo '<pre>'.print_r($list, 1).'</pre>';
$list[] = 6;
$list[] = 7;
foreach($list as $rec);
echo '<pre>'.print_r($list, 1).'</pre>';