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<?php function array_transpose_basic(array|object $object_or_array): array|object { $levelOneType = gettype($object_or_array); if (!in_array($levelOneType, ['array', 'object'])) { throw new Exception("Error: array_transpose() expects parameter 1 to be an array or object, $levelOneType given"); } $result = []; foreach ($object_or_array as $rowKey => $row) { $levelTwoType = gettype($row); if (!in_array($levelTwoType, ['array', 'object'])) { throw new Exception("Error: array_transpose() expects parameter 1 to contain rows of arrays or objects, $levelTwoType given"); } foreach ($row as $columnKey => $value) { $result[$columnKey][$rowKey] = $value; } } return $result; } function array_transpose_types(array|object $object_or_array): array|object { $levelOneType = gettype($object_or_array); if (!in_array($levelOneType, ['array', 'object'])) { throw new Exception("Fatal error: Uncaught TypeError: array_transpose(): Argument #1 ($object_or_array) must be of type object|array, $levelOneType given"); } foreach ($object_or_array as $rowKey => $row) { $levelTwoType = gettype($row); if (!in_array($levelTwoType, ['array', 'object'])) { throw new Exception("Fatal error: Uncaught TypeError: array_transpose(): Argument #1 ($object_or_array) must contain rows of type object|array, $levelTwoType given"); } $result ??= ($levelTwoType === 'array' ? [] : (object)[]); foreach ($row as $columnKey => $value) { if ($levelTwoType === 'array') { if ($levelOneType === 'array') { $result[$columnKey][$rowKey] = $value; } else { $result[$columnKey]->$rowKey = $value; } } else { if (!property_exists($result, $columnKey)) { $result->$columnKey = ($levelOneType === 'array' ? [] : (object)[]); } if ($levelOneType === 'array') { $result->{$columnKey}[$rowKey] = $value; } else { $result->{$columnKey}->$rowKey = $value; } } } } return $result ?? ($levelOneType === 'array' ? [] : (object)[]); } function array_transpose_splat(array|object $object_or_array): array { if (!is_array($object_or_array)) { return ["must be array"]; } if (!$object_or_array) { return ["must not be empty"]; } foreach ($object_or_array as $key => $value) { if (!ctype_digit((string)$key)) { return ["may only contain numeric first level keys"]; } if (!is_array($value)) { return ["may only contain arrays in second level"]; } } return array_map(null, ...$object_or_array); } $test = ['a' => [1], 'b' => [2, 3]]; echo var_export(array_transpose_basic($test), true) . "\n---\n"; echo var_export(array_transpose_types($test), true) . "\n---\n"; echo var_export(array_transpose_splat($test), true);