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    <p>Maybe you can use this function, assuming that:</p> <p>... <code>$inventory</code> is already sorted (all <code>A</code> come before <code>B</code>)<br /> ... <code>$inventory</code> is a numeric array staring at index zero </p> <pre><code>// $set is the collection to which the generated sets are appended // $inventory is your inventory, see the assumptions above // $aCount - the number of A elements in a set // $bCount - the number of B elements in a set function makeSets(array &amp;$sets, array $inventory, $aCount, $bCount) { // extract $aItems from $inventory and shorten $inventory by $aCount $aItems = array_splice($inventory, 0, $aCount); $bItems = array(); // iterate over $inventory until a B item is found foreach($inventory as $index =&gt; $item) { if($item[0] == 'B') { // extract $bItems from $inventory and shorten $inventory by $bCount // break out of foreach loop after that $bItems = array_splice($inventory, $index, $bCount); break; } } // append $aItems and $bItems to $sets, padd this array with null if // less then $aCount + $bCount added $sets[] = array_pad(array_merge($aItems, $bItems), $aCount + $bCount, null); // if there are still values left in $inventory, call 'makeSets' again if(count($inventory) &gt; 0) makeSets($sets, $inventory, $aCount, $bCount); } $sets = array(); makeSets($sets, $inventory, 1, 2); print_r($sets); </code></pre> <p>Since you mentioned that you dont have that much experience with arrays, here are the links to the php documentation for the functions I used in the above code:</p> <ul> <li><a href="http://de2.php.net/manual/en/function.array-splice.php" rel="nofollow noreferrer"><code>array_splice</code></a> — Remove a portion of the array and replace it with something else</li> <li><a href="http://de2.php.net/manual/en/function.array-merge.php" rel="nofollow noreferrer"><code>array_merge</code></a> — Merge one or more arrays</li> <li><a href="http://de2.php.net/manual/en/function.array-pad.php" rel="nofollow noreferrer"><code>array_pad</code></a> — Pad array to the specified length with a value</li> </ul>
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