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CREATE TABLE office_layout ( floor INT, office INT ); INSERT INTO office_layout (floor, office) VALUES (1, 4), (2, 4), (3, 3), (4, 3), (1, 5), (2, 5), (3, 4), (4, 4), (1, 6), (2, 6), (3, 5), (4, 5), (2, 7), (3, 6), (4, 6), (3, 7), (4, 7);
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<?php $sql = <<<SQL SELECT * FROM office_layout ORDER BY floor, office SQL; $result = $mysqli->query($sql)->fetch_all(MYSQLI_ASSOC); var_export($result); var_export( array_map( function ($row) { static $c = []; return $c[$row['floor']] = ($c[$row['floor']] ?? 0) + 1; }, $result ) ); /* array_multisort( array_map( function ($row) { static $c; return $c[$row['floor']] = ($c[$row['floor']] ?? 0) + 1; }, $result ), $result ); var_export($result);*/
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