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

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']