UNIFIED DATA PROCESSING FRAMEWORK

composer require flow-php/etl ~0.18.0

Changelog Release Cycle

Extracts

Read from various data sources.

Transforms

Shape and optimize for your needs.

Loads

Store and secure in one of many available data sinks.

Examples:

Description

The easiest way to call any callable. Whenever you need to apply a function or method to a column or a value, and there is no existing scalar function available, you can use the call scalar function.

There are two ways to use it:

ref('column')->call()
\Flow\ETL\DSL\call()

The main difference is that the first one will always pass the column value as argument.
When passing additional arguments, it might be necessary to use refAlias to provide a argument name for column value.

Download

composer.json

{
    "name": "flow-php/examples",
    "description": "Flow PHP - Examples",
    "license": "MIT",
    "type": "library",
    "require": {
        "flow-php/etl": "1.x-dev"
    }
}

code.php

<?php

declare(strict_types=1);

use function Flow\ETL\DSL\{data_frame,
    from_array,
    lit,
    ref,
    to_stream};
use function Flow\Types\DSL\{type_integer, type_list};

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

(data_frame())
    ->read(
        from_array(
            [
                ['integers' => '1,2,3'],
                ['integers' => '5,7'],
                ['integers' => '0,2,4'],
            ]
        )
    )
    ->withEntry(
        'integers',
        ref('integers')->call(lit('explode'), ['separator' => ','], refAlias: 'string', returnType: type_list(type_integer()))
    )
    ->write(to_stream(__DIR__ . '/output.txt', truncate: false))
    ->run();

Output

+----------+
| integers |
+----------+
|  [1,2,3] |
+----------+
1 rows
+----------+
| integers |
+----------+
|    [5,7] |
+----------+
1 rows
+----------+
| integers |
+----------+
|  [0,2,4] |
+----------+
1 rows

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