<?php function iterate($current, $queue, $result = null) { if (!$current) { return $result; } return iterate(step($queue), $queue, $current); } function step(&$queue) { return next($queue); } function start($queue) { return current($queue); } function traverse($queue) { return iterate(start($queue), $queue); } $queue = ['foo', 'bar', 'baz']; $queue = unserialize(serialize($queue)); echo traverse($queue); //baz
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