Example: Filter divide
Topic: Transformations
Code
<?php
declare(strict_types=1);
use function Flow\ETL\DSL\{data_frame, from_rows, int_entry, lit, ref, row, rows, to_stream};
require __DIR__ . '/../../../autoload.php';
data_frame()
->read(from_rows(rows(
row(int_entry('a', 100), int_entry('b', 100)),
row(int_entry('a', 100), int_entry('b', 200))
)))
->filter(ref('b')->divide(lit(2))->same(ref('a')))
->withEntry('new_b', ref('b')->multiply(lit(2))->multiply(lit(5)))
->write(to_stream(__DIR__ . '/output.txt', truncate: false))
->run();
Output
+-----+-----+-------+
| a | b | new_b |
+-----+-----+-------+
| 100 | 200 | 2000 |
+-----+-----+-------+
1 rows
Examples
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