Online PHP editor | rfc for AhvWj

@ 2014-01-29T17:53:46Z

<?php

$vendors = ["Amazon", "Newegg", "Frys"];
$products = ['a', 'b'];
$combinations = array();

// Algorithm to generate all combinations of a specific size from an array of possible values
function sampling($chars, $size, $combinations = array()) {

    # if it's the first iteration, the first set 
    # of combinations is the same as the set of characters
    if (empty($combinations)) {
        $combinations = $chars;
    }

    # we're done if we're at size 1
    if ($size == 1) {
        return $combinations;
    }

    # initialise array to put new values in
    $new_combinations = array();

    # loop through existing combinations and character set to create strings
    foreach ($combinations as $combination) {
        foreach ($chars as $char) {
            $new_combinations[] = $combination . $char;
        }
    }

    # call same function again for the next iteration
    return sampling($chars, $size - 1, $new_combinations);

}

// Build vendor combinations as a function of the number of products. Example with 5 products:
// ['Amazon', 'Amazon', 'Amazon', 'Newegg', 'Newegg']
$combinations = sampling($vendors, count($products));

foreach ($combinations as $key => $combination) {
	// Calculate the total price
    var_dump($combination);

}

Output for git.master, git.master_jit, rfc.property-hooks: string(12) "AmazonAmazon" string(12) "AmazonNewegg" string(10) "AmazonFrys" string(12) "NeweggAmazon" string(12) "NeweggNewegg" string(10) "NeweggFrys" string(10) "FrysAmazon" string(10) "FrysNewegg" string(8) "FrysFrys"

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