Examples

Writing

Description

to_text() writes one line per row, so the frame has to be reduced to a single column first.

Documentation

Writers are loaders: they consume Rows and decide what already at the destination means.

Code

<?php

declare(strict_types=1);

use function Flow\ETL\Adapter\Text\to_text;
use function Flow\ETL\DSL\{concat_ws, data_frame, from_array, overwrite, ref};

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

data_frame()
    ->read(
        from_array([
            ['id' => 1, 'name' => 'John', 'age' => 30],
            ['id' => 2, 'name' => 'Jane', 'age' => 25],
            ['id' => 3, 'name' => 'Bob', 'age' => 35],
            ['id' => 4, 'name' => 'Alice', 'age' => 28],
            ['id' => 5, 'name' => 'Charlie', 'age' => 32],
        ])
    )
    ->withEntry('line', concat_ws('_', ref('id'), ref('name'), ref('age')))
    ->select('line')
    ->collect()
    ->write(to_text(__DIR__ . '/lines.txt')->saveMode(overwrite()))
    ->run();

// the write is the lesson, so read it back and show it
echo file_get_contents(__DIR__ . '/lines.txt');

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