fs-draft.git

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<?php
    function sql_cross($table_left, $table_right)
    {
        $table_result = [];
        array_map
        (
            function ($row_left) use (&$table_left,&$table_right,&$table_result)
            {
                array_map
                (
                    function ($row_right) use (&$table_left,&$table_right,&$table_result,&$row_left)
                    {
                        $row_result = [];
                        foreach ($row_left as $key_left => $value_left) $row_result[$key_left] = $value_left;
                        foreach ($row_right as $key_right => $value_right) $row_result[$key_right] = $value_right;
                        array_push($table_result, $row_result);
                    },
                    $table_right
                );
            },
            $table_left
        );
        return $table_result;
    }
    
    function sql_cross_all($tables_source)
    {
        $n = count($tables_source);
        if ($n == 1)
        {
            return $tables_source[0];
        }
        else
        {
            return sql_cross(sql_cross_all(array_slice($tables_source, $n-1)), $tables_source[$n-1]);
        }
    }
    
    function sql_rename($table_source, $column_from, $column_to)
    {
        return (
            array_map
            (
                function ($row_in) use (&$column_from,&$column_to)
                {
                    $row_out = [];
                    foreach ($row_in as $column => $value)
                    {
                        $row_out[($column == $column_from) ? $column_to : $column] = $row_in[$column];
                    }
                    return $row_out;
 
 
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