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    <p>One algorithm is here,</p> <pre><code>function getCombinations($base,$n){ $baselen = count($base); if($baselen == 0){ return; } if($n == 1){ $return = array(); foreach($base as $b){ $return[] = array($b); } return $return; }else{ //get one level lower combinations $oneLevelLower = getCombinations($base,$n-1); //for every one level lower combinations add one element to them that the last element of a combination is preceeded by the element which follows it in base array if there is none, does not add $newCombs = array(); foreach($oneLevelLower as $oll){ $lastEl = $oll[$n-2]; $found = false; foreach($base as $key =&gt; $b){ if($b == $lastEl){ $found = true; continue; //last element found } if($found == true){ //add to combinations with last element if($key &lt; $baselen){ $tmp = $oll; $newCombination = array_slice($tmp,0); $newCombination[]=$b; $newCombs[] = array_slice($newCombination,0); } } } } } return $newCombs; } </code></pre> <p>I know it is not efficent in any way, but using in small sets should not be a problem</p> <p>first base parameter is an array containing elements to be considered when generating combinations.</p> <p>for simple usage and output:</p> <pre><code>var_dump(getCombinations(array("a","b","c","d"),2)); </code></pre> <p>and output is</p> <pre><code>array 0 =&gt; array 0 =&gt; string 'a' (length=1) 1 =&gt; string 'b' (length=1) 1 =&gt; array 0 =&gt; string 'a' (length=1) 1 =&gt; string 'c' (length=1) 2 =&gt; array 0 =&gt; string 'a' (length=1) 1 =&gt; string 'd' (length=1) 3 =&gt; array 0 =&gt; string 'b' (length=1) 1 =&gt; string 'c' (length=1) 4 =&gt; array 0 =&gt; string 'b' (length=1) 1 =&gt; string 'd' (length=1) 5 =&gt; array 0 =&gt; string 'c' (length=1) 1 =&gt; string 'd' (length=1) </code></pre> <p>To list all subsets of an array, using this combinations algorithm just execute</p> <pre><code>$base =array("a","b","c","d"); for($i = 1; $i&lt;=4 ;$i++){ $comb = getCombinations($base,$i); foreach($comb as $c){ echo implode(",",$c)."&lt;br /&gt;"; } } </code></pre> <p>And output is</p> <pre><code>a b c d a,b a,c a,d b,c b,d c,d a,b,c a,b,d a,c,d b,c,d a,b,c,d </code></pre>
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    1. POPhp recursion to get all possibilities of strings
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    1. COWow, thank you so much; works great!
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    2. COIn a list like Array ( [0] => 10 [1] => 10 [2] => 14 [3] => 39 [4] => 39 [5] => 39 [6] => 39 [7] => 40 [8] => 40 [9] => 42 [10] => 42 [11] => 45 ) How can I create permutations like 10, 10, 14 and not just 10, 14, 39?
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