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    <p>I do not understand the purpose of this, but maybe something like this?</p> <p>Instead of using $row1, $row2, $row3 etc I did these an array. Array is more flexibile to use in this situation. I did an example of how you could input your current variables into one array.</p> <p>I've changed the code and I'm now using a diffrent approach. I use an object to store the array, and after that I use the stored array in the object to "reset" at each iteration of the loop. (OOP is the best way to do things anyway :-)) </p> <pre><code>&lt;?php //Create a class to handle array class arrayHandler { private $row = array(); public function __construct(Array $row) { $this-&gt;row = $row; //Put array into object member } public function loopArray($num=7, $numRandomEntries=3) { for ($nr = 0;$nr&lt;intval($num);$nr++) { //Do seven loops //Get array stored in object $row = $this-&gt;row; //Get three random keys from the $row-array $randomEntries = array_rand($row, intval($numRandomEntries)); //Set random entries elements to value 0 foreach($randomEntries as $key) { $row[$key] = array_fill_keys(range('a', 'f'), 0); } $nNr = $nr+1; echo "row$nNr = " . print_r($row,true)."&lt;hr /&gt;"; //For testing } } } //Your variables with stored arrays... $row1 = array('a' =&gt; 1, 'b' =&gt; 2, 'c' =&gt; 3, 'd' =&gt; 4, 'e' =&gt; 5, 'f' =&gt; 6); $row2 = array('a' =&gt; 1, 'b' =&gt; 2, 'c' =&gt; 3, 'd' =&gt; 4, 'e' =&gt; 5, 'f' =&gt; 6); $row3 = array('a' =&gt; 1, 'b' =&gt; 2, 'c' =&gt; 3, 'd' =&gt; 4, 'e' =&gt; 5, 'f' =&gt; 6); $row4 = array('a' =&gt; 1, 'b' =&gt; 2, 'c' =&gt; 3, 'd' =&gt; 4, 'e' =&gt; 5, 'f' =&gt; 6); $row5 = array('a' =&gt; 1, 'b' =&gt; 2, 'c' =&gt; 3, 'd' =&gt; 4, 'e' =&gt; 5, 'f' =&gt; 6); $row6 = array('a' =&gt; 1, 'b' =&gt; 2, 'c' =&gt; 3, 'd' =&gt; 4, 'e' =&gt; 5, 'f' =&gt; 6); //Create ONE array from each variable above $row = array(); $row[0] = $row1; $row[1] = $row2; $row[2] = $row3; $row[3] = $row4; $row[4] = $row5; $row[5] = $row6; //Create the object and do the looping $ah = new arrayHandler($row); $ah-&gt;loopArray(); ?&gt; </code></pre>
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    1. POI want to test an equation on arrays every unique combination of them, How could I do that using PHP?
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    1. USbestprogrammerintheworld
    1. USbestprogrammerintheworld
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    1. COThe result seems to be good, but why you did generate the arrays? I have a certain arrays those I need to apply the combination on them. Theres also a repeated combination rather than the array were 5 not six.
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    2. CO@m.rizeg - I aplologize for having 5 and not six. That is changed. I've also changed to OOP-style coding. I did an array of your current $row1, 2, 3 etc... so it would be easy to iterate through them and easy to randomly select select 3 of them. I inputted some code so you can use to combine your current row-variables. I hope this makes it easier to understand.
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