flow php

Documentation

Core

Adapters

Libraries

Bridges

Example: Last

Topic: Aggregations

Code

<?php

declare(strict_types=1);

use function Flow\ETL\DSL\{data_frame, from_rows, int_entry, last, ref, row, rows, to_stream};

require __DIR__ . '/../../../autoload.php';

data_frame()
    ->from(from_rows(rows(
        row(int_entry('a', 100)),
        row(int_entry('a', 100)),
        row(int_entry('a', 200)),
        row(int_entry('a', 400)),
        row(int_entry('a', 400))
    )))
    ->aggregate(last(ref('a')))
    ->write(to_stream(__DIR__ . '/output.txt', truncate: false))
    ->run();

Output

+--------+
| a_last |
+--------+
|    400 |
+--------+
1 rows

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