Examples

Columns

Description

rename_map() renames several columns in one pass, old name to new. Columns not in the map are untouched.

Documentation

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

Rename
Select and Drop
Data Manipulation

Code

<?php

declare(strict_types=1);

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

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

data_frame()
    ->read(from_array([
        ['id' => 1, 'first_name' => 'Norbert', 'last_name' => 'Orzechowicz'],
        ['id' => 2, 'first_name' => 'John', 'last_name' => 'Doe'],
    ]))
    ->renameEach(rename_map([
        'id' => 'user_id',
        'first_name' => 'name',
        'last_name' => 'surname',
    ]))
    ->collect()
    ->write(to_output(truncate: false))
    ->run();

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