<?php $lists = [ ['A', 'B', 'C', 'D', 'E'], ['A', 'B', 'C', 'D'], ['A', 'B', 'C', 'D', 'E', 'F'], ]; foreach ($lists as &$row) { $newRow = []; foreach ($row as $i => $v) { $newRow['Key' . $i + 1] = $v; } $row = $newRow; } var_export($lists);
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