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<?php $configArray = array( 'grand_total' => array( 'after' => array(), 'before' => array(), '_code' => 'grand_total', ), 'discount' => array( 'after' => array(), 'before' => array('grand_total'), '_code' => 'discount', ), 'tax_subtotal' => array( 'after' => array( 0 => 'freeshipping', ), 'before' => array( 0 => 'tax', 1 => 'discount', ), '_code' => 'tax_subtotal', ), 'tax_shipping' => array( 'after' => array( 0 => 'shipping', 1 => 'tax_subtotal', ), 'before' => array( 0 => 'tax', 1 => 'discount', ), '_code' => 'tax_shipping', ), ); reset($configArray); $element = current($configArray); foreach ($configArray as $code => $data) { foreach ($data['before'] as $beforeCode) { if (!isset($configArray[$beforeCode])) { continue; } $configArray[$code]['before'] = array_unique( array_merge( $configArray[$code]['before'], $configArray[$beforeCode]['before'] ) ); $configArray[$beforeCode]['after'] = array_merge( $configArray[$beforeCode]['after'], array($code), $data['after'] ); $configArray[$beforeCode]['after'] = array_unique($configArray[$beforeCode]['after']); } foreach ($data['after'] as $afterCode) { if (!isset($configArray[$afterCode])) { continue; } $configArray[$code]['after'] = array_unique( array_merge( $configArray[$code]['after'], $configArray[$afterCode]['after'] ) ); $configArray[$afterCode]['before'] = array_merge( $configArray[$afterCode]['before'], array($code), $data['before'] ); $configArray[$afterCode]['before'] = array_unique($configArray[$afterCode]['before']); } } function compareTotals($a, $b) { $aCode = $a['_code']; $bCode = $b['_code']; if (in_array($aCode, $b['after']) || in_array($bCode, $a['before'])) { $res = -1; } elseif (in_array($bCode, $a['after']) || in_array($aCode, $b['before'])) { $res = 1; } else { $res = 0; } return $res; } uasort($configArray, 'compareTotals'); print_r(array_keys($configArray));