Examples

Columns

Description

Choose specific columns from your data, discarding the rest. Transformations like select help keep pipelines readable and explicit about which data is being processed.

Documentation

Column operations rewrite the schema, and the rows follow it.

Rename
Select and Drop
Transformations

Code

<?php

declare(strict_types=1);

use function Flow\ETL\DSL\{data_frame, from_array, select, to_output};

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

data_frame()
    ->read(
        from_array([
            ['id' => 1, 'first_name' => 'John', 'last_name' => 'Doe'],
            ['id' => 2, 'first_name' => 'Jane', 'last_name' => 'Smith'],
            ['id' => 3, 'first_name' => 'Bob', 'last_name' => 'Johnson'],
            ['id' => 4, 'first_name' => 'Alice', 'last_name' => 'Williams'],
        ])
    )
    ->with(select('id'))
    ->collect()
    ->write(to_output(truncate: false))
    ->run();

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