<?php $a = array('a', 'b', 'c', 'd', null); for($i = 0; $i < count($a); $i += 2) { echo $i . " "; if (array_key_exists($i + 1, $a)) { echo $a[$i + 1] . " "; } echo ($i + 1) . PHP_EOL; } $n = explode('|', $a[5]); var_dump($n);
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