<?php
$а = array(1=>10, 2=>20, 3=>30); $b = &$а[1];
echo $b;
$а[1] = $а[2];
echo $a[1];
$а[1] = &$а[3];
echo $b;
?>
PD9waHAKCSTQsCA9IGFycmF5KDE9PjEwLCAyPT4yMCwgMz0+MzApOwoJJGIgPSAmJNCwWzFdOwoJZWNobyAkYjsKCSTQsFsxXSA9ICTQsFsyXTsKZWNobyAkYVsxXTsKCSTQsFsxXSA9ICYk0LBbM107CgllY2hvICRiOwo/Pg==