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    <p>Here is a much updated answer (originally updated from this answer]<a href="http://php.net/manual/en/function.vsprintf.php" rel="nofollow">1</a>) to your question:</p> <pre><code>function findPermutations($arr, $arrLen, $size, $perArr = array(), $pos = 0, &amp;$found = array()) { if ($size==$pos) { //if $pos reach $size then we have found one permutation $found[] = vsprintf("%s%s|%s%s|%s%s", $perArr); return; } for ($i=0; $i&lt;$arrLen; $i++) { $perArr[$pos] = $arr[$i]; //put i'th char in current position //The recursive call that move to next position with $pos+1 findPermutations($arr, $arrLen, $size, $perArr, $pos+1, $found); } return $found; } $permutations = array(); $letters = array('1','2','3'); $max_length = 6; $permutations = findPermutations($letters, count($letters), $max_length); for($i = 0; $i &lt; count($permutations); $i++) { print ($permutations[$i].'&lt;br/&gt;'); } </code></pre> <p>Here is what I'm doing. I'm passing in an empty array called <code>$permutations</code> by reference, and as I find new permutations, I'm appending them to it. When the function <code>findPermutations()</code> is complete, I end up with an array of all permutation, that I can iterate over or insert. To get the formatting I'm using <a href="http://php.net/manual/en/function.vsprintf.php" rel="nofollow">vsprintf</a>, that lets me pass an array of data and apply a format (in this case <code>%s%s|%s%s|%s%s</code>). Lastly I'm using default argument values to make calling this function cleaner.</p>
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    1. POPHP List all possible 6-digit numbers with specific digits
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    1. USJason Sperske
    1. USJason Sperske
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    1. POPHP List all possible 6-digit numbers with specific digits
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    1. COYou can test this here: http://phpcodepad.com/
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      1. USJason Sperske
    2. COThanks for that, it's perfect. However - how can I separate each 2 digits with a "|", please? Sorry, I'm new to PHP.
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    3. COThous lines above the `return` statement are for printing out each permutation, you can change them to something like `print $perArr[0].$perArr[1].'|'.$perArr[2].$perArr[3].'|'.$perArr[4].$perArr[5]` or that could eb where you add your MySQL INSERT command (I'd rename it storePermutation if you did that)
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