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    <p>I've something that You may like</p> <pre><code>function combination_number($k,$n){ $n = intval($n); $k = intval($k); if ($k &gt; $n){ return 0; } elseif ($n == $k) { return 1; } else { if ($k &gt;= $n - $k){ $l = $k+1; for ($i = $l+1 ; $i &lt;= $n ; $i++) $l *= $i; $m = 1; for ($i = 2 ; $i &lt;= $n-$k ; $i++) $m *= $i; } else { $l = ($n-$k) + 1; for ($i = $l+1 ; $i &lt;= $n ; $i++) $l *= $i; $m = 1; for ($i = 2 ; $i &lt;= $k ; $i++) $m *= $i; } } return $l/$m; } function array_combination($le, $set){ $lk = combination_number($le, count($set)); $ret = array_fill(0, $lk, array_fill(0, $le, '') ); $temp = array(); for ($i = 0 ; $i &lt; $le ; $i++) $temp[$i] = $i; $ret[0] = $temp; for ($i = 1 ; $i &lt; $lk ; $i++){ if ($temp[$le-1] != count($set)-1){ $temp[$le-1]++; } else { $od = -1; for ($j = $le-2 ; $j &gt;= 0 ; $j--) if ($temp[$j]+1 != $temp[$j+1]){ $od = $j; break; } if ($od == -1) break; $temp[$od]++; for ($j = $od+1 ; $j &lt; $le ; $j++) $temp[$j] = $temp[$od]+$j-$od; } $ret[$i] = $temp; } for ($i = 0 ; $i &lt; $lk ; $i++) for ($j = 0 ; $j &lt; $le ; $j++) $ret[$i][$j] = $set[$ret[$i][$j]]; return $ret; } </code></pre> <p>Here is how to use it:</p> <p>To get the number of combinations:</p> <pre><code>combination_number(3,10); // returns number of combinations of ten-elements set. </code></pre> <p>To get all possible combinations:</p> <pre><code>$mySet = array("A","B","C","D","E","F"); array_combination(3, $mySet); // returns all possible combinations of 3 elements of six-elements set. </code></pre> <p>Hope You make use of that.</p>
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    1. USPiotr Salaciak
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    1. COCute, but this is only maintaining order.
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      1. USBill Ortell
 

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