Online PHP editor | output for EkJ2Y

@ 2017-05-10T20:14:52Z

<?php

function direct_product(array ...$arrays)
{
    $result = [[]];
    foreach ($result as $i => $x) {
        foreach ($arrays as $y) {
            $result[$i] = array_merge($x, [$y]);
        }
    }
    return $result;
}

var_export(direct_product(['A', 'B', 'C'], ['a'], [1, 2]));
/*
array (
  0 => 
  array (
    0 => 'A',
    1 => 'a',
    2 => 1,
  ),
  1 => 
  array (
    0 => 'A',
    1 => 'a',
    2 => 2,
  ),
  2 => 
  array (
    0 => 'B',
    1 => 'a',
    2 => 1,
  ),
  3 => 
  array (
    0 => 'B',
    1 => 'a',
    2 => 2,
  ),
  4 => 
  array (
    0 => 'C',
    1 => 'a',
    2 => 1,
  ),
  5 => 
  array (
    0 => 'C',
    1 => 'a',
    2 => 2,
  ),
)
*/

var_export(direct_product(['A', 'B', 'C'], [], [1, 2]));
/*
array (
)
*/

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: array ( 0 => array ( 0 => array ( 0 => 1, 1 => 2, ), ), )array ( 0 => array ( 0 => array ( 0 => 1, 1 => 2, ), ), )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array ( 0 => array ( 0 => array ( 0 => 1, 1 => 2, ), ), )array ( 0 => array ( 0 => array ( 0 => 1, 1 => 2, ), ), )

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