arrayMultiSort

gistfile1.aw

    public static function arrayMultiSort(array &$array, array $sortFields, $phpCompareMethod = 'strnatcasecmp')
    {
        if ( count($sortFields) == 0 ) {
            throw new Exception('Missing fields to sort by');
        } elseif ( empty($array) || count($array) == 1 ) {
            // We return true because "technically" the sort succeeded even though
            // we didn't really sort anything. aka it didn't fail so it must be successful
            return true;
        }

        if ( !function_exists($phpCompareMethod) ) {
            throw new Exception("$phpCompareMethod is not a valid function");
        }

        $compareFields = array();
        foreach ($sortFields as $fieldName => $sortDirection) {
            if ($sortDirection === SORT_DESC) {
                $compareFields[] = array('fieldName' => $fieldName, 'sortValue' => -1);
            } else {
                $compareFields[] = array('fieldName' => $fieldName, 'sortValue' => 1);
            }
        }

        // Closure method to pass to uasort
        $compareFunction = function($a, $b, $idx = 0) use (&$compareFunction, $compareFields, $phpCompareMethod) {
            $returnValue = $compareFields[$idx]['sortValue'] * @$phpCompareMethod($a[$compareFields[$idx]['fieldName']], $b[$compareFields[$idx]['fieldName']]);
            if ( $returnValue == 0 && $idx < (count($compareFields) - 1) ) {
                return $compareFunction($a, $b, ($idx+1));
            }
            return $returnValue;
        };

        return uasort($array, $compareFunction);
    }