glagola/cross-product-iterator

Cross product of unlimited arrays without any recursion

1.0.1 2018-01-16 13:41 UTC

Requires

• php: >=5.1.0

MIT

• Igor Glagola

README

Cross product of provided iterators

Required php version at least 5.1

Installation

The preferred way to install this extension is through composer.

Either run

php composer.phar require "glagola/cross-product-iterator" "*"

or add

"glagola/cross-product-iterator" : "*"

to the require section of your application's composer.json file.

Example

Code

<?php

use Glagola\CrossProductIterator;

function aa() {
    yield 'x1';
    yield 'x2';
    yield 'x3';
}

$iterator = new CrossProductIterator([
    aa(),
    new ArrayIterator(['y1']),
    new ArrayIterator(['z1', 'z2', 'z3']),
    new ArrayIterator(['f1', 'f2', 'f3']),
]);

foreach ($iterator as $items) {
    echo "['", implode("', '", $items), "']", PHP_EOL;
}

Output

['x1', 'y1', 'z1', 'f1']
['x1', 'y1', 'z1', 'f2']
['x1', 'y1', 'z1', 'f3']
['x1', 'y1', 'z2', 'f1']
['x1', 'y1', 'z2', 'f2']
['x1', 'y1', 'z2', 'f3']
['x1', 'y1', 'z3', 'f1']
['x1', 'y1', 'z3', 'f2']
['x1', 'y1', 'z3', 'f3']
['x2', 'y1', 'z1', 'f1']
['x2', 'y1', 'z1', 'f2']
['x2', 'y1', 'z1', 'f3']
['x2', 'y1', 'z2', 'f1']
['x2', 'y1', 'z2', 'f2']
['x2', 'y1', 'z2', 'f3']
['x2', 'y1', 'z3', 'f1']
['x2', 'y1', 'z3', 'f2']
['x2', 'y1', 'z3', 'f3']
['x3', 'y1', 'z1', 'f1']
['x3', 'y1', 'z1', 'f2']
['x3', 'y1', 'z1', 'f3']
['x3', 'y1', 'z2', 'f1']
['x3', 'y1', 'z2', 'f2']
['x3', 'y1', 'z2', 'f3']
['x3', 'y1', 'z3', 'f1']
['x3', 'y1', 'z3', 'f2']
['x3', 'y1', 'z3', 'f3']