- array_splice: documentation ( source)
- array_unshift: documentation ( source)
- print_r: documentation ( source)
- array_pop: documentation ( source)
<?php
$array = [1, 6, 2];
array_unshift($array, array_pop($array));
print_r($array);
$array = [1, 6, 2];
$tmp = array_splice($array, 2, 1);
array_unshift($array, $tmp[0]);
print_r($array);