3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?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 5.4.0 - 7.1.0
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"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/AhvWj on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/AhvWj on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/AhvWj on line 3
Process exited with code 255.