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  1. PO
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    <p>The code basically treats the character combination like a base-35 number. It adds one each loop.</p> <pre><code>&lt;?php $char=array("1","2","3","4","5","6","7","8","9","0","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","-"); $doma=array("aero","asia","biz","cat","com","coop","info","int","jobs","mobi","museum","name","net","org","pro","tel","travel","xxx","edu","gov","mil","co.uk","co.nr","co.au","au","ca","co.cc","cc","co","cn","co.jp","de","es","ie","in","it","jp","nl","nz","ru","co.tk","tk","tv","us"); $combo = array(0,0,0,0,0,0,0,0,0,0); //this stores the ten "digits" of the characters $pval = 9; //this is the active "place value", the one that you increment $list = ""; for($i=0;$i&lt;44;$i++) { //loops through doma for($j=0;$j&lt;2758547353515625;$j++) { //loops through character combos, that long number is the permutations for($l=0;$l&lt;10;$l++) { //loop displays combo $list .= $char[$combo[$l]]; } $list .= "." . $doma[$i] . "&lt;br/&gt;"; //add combo to list /*This next part check to see if the active digit is 35. It is is, it sets it equal to zero and looks to the digit on the left. It repeats this until it no longer finds a 35. This is like going from 09 to 10 in the decimal system. */ if($combo[$pval] == 35) { while($combo[$pval] == 35) { $combo[$pval] = 0; $pval--; } } $combo[$pval]++; //whatever digit it left on gets incremented. $pval = 9; //reset, go back to first place value } for($l=0;$l&lt;10;$l++) { $combo[$l] = 0; //reset combo for the next top level domain } } echo $list; //print the compiled list. ?&gt; </code></pre>
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    1. POloop through multiple arrays incrementing length of string
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    1. COYou don't give any explanation for this code. For one, why are you using `350000000000` in the loop (apart from the fact it's a numeric limit)?
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      1. USBojangles
    2. COThis seems quite complex, and also uses a massive amount of memory for keeping the entire string of all combinations. It also doesn't conform to the spec, it just prints all 10-character combinations of elements in $char.
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      1. USFabian Fagerholm
 

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