Iterator, returning the cartesian product of associative array of iterators. See https://en.wikipedia.org/wiki/Cartesian_product .
- https://github.com/phpbench/phpbench/blob/master/lib/Benchmark/CartesianParameterIterator.php : A little bit more messy.
- https://github.com/bpolaszek/cartesian-product : Not so laconic - but covered by tests.
- https://stackoverflow.com/a/15973172 : Pretty simple though no iterator, plain array-stuff.
https://github.com/PatchRanger/php-cartesian-benchmark
<?php
use PatchRanger\CartesianIterator;
require 'vendor/autoload.php';
$cartesianIterator = new CartesianIterator();
// The second argument controls the key of the corresponding value in the product array.
$cartesianIterator->attachIterator(new ArrayIterator([1,2]), 'test');
// No second argument means incremental numeration (indexed).
$cartesianIterator->attachIterator(new ArrayIterator(['foo', 'bar']));
$result = iterator_to_array($cartesianIterator);
print_r($result);Result:
Array
(
[0] => Array
(
[test] => 1
[1] => foo
)
[1] => Array
(
[test] => 2
[1] => foo
)
[2] => Array
(
[test] => 1
[1] => bar
)
[3] => Array
(
[test] => 2
[1] => bar
)
)
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