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@ 2016-10-27T12:33:33Z

<?php
$facts = [];

function fact($N, &$facts) 
{
    if ($N<=1) {
        return 1;
    }
    if (!array_key_exists($N, $facts)) {
        $facts[$N] = $N * fact($N - 1, $facts);
    }
    return $facts[$N];
}

function C($n, $k, &$facts) 
{
  return fact($n, $facts) / fact($k, $facts) / fact($n - $k, $facts);
}

function combination ($index, $k, $A, $facts) 
{
    $res = [0];
    $n = sizeof($A);
    $s = 0;
    for ($t = 1; $t <= $k; $t++) {
        $j = $res[$t - 1] + 1;
        while (($j < ($n - $k + $t)) && (($s + C($n - $j, $k - $t, $facts)) <= $index)) {
          $s += C($n - $j, $k - $t, $facts);
          $j++;
        }
        $res[] = $j;
      }
    array_splice($res, 0, 1);
    print_r($res);
}

$m = [1,2,3,4,5];

for ($i = 0; $i < C(sizeof($m), 3, $facts); $i++) {
    combination($i, 3, array_slice($m, 0), $facts);
}

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => 1 [1] => 2 [2] => 3 ) Array ( [0] => 1 [1] => 2 [2] => 4 ) Array ( [0] => 1 [1] => 2 [2] => 5 ) Array ( [0] => 1 [1] => 3 [2] => 4 ) Array ( [0] => 1 [1] => 3 [2] => 5 ) Array ( [0] => 1 [1] => 4 [2] => 5 ) Array ( [0] => 2 [1] => 3 [2] => 4 ) Array ( [0] => 2 [1] => 3 [2] => 5 ) Array ( [0] => 2 [1] => 4 [2] => 5 ) Array ( [0] => 3 [1] => 4 [2] => 5 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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