<?php $input = [ ["relation" => "OR"], ["color" => 'green'], ["color" => 'yellow'], ["relation" => "AND"], ["color" => 'black'], ["color" => 'orange'], ["relation" => "OR"], ["color" => 'blue'], ["color" => 'violet'], ]; $ref = []; $result = &$ref; foreach ($input as $row) { if (key($row) !== 'relation') { // populate current level $ref[] = $row; continue; } if ($ref) { // not the first relation encountered $ref = &$ref[]; } $ref = $row; // store relation } var_export($result);
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