Posted by Chung Leong on 12/04/05 18:31

The hash table was invented precisely to solve this sort of problem.

Example:

$first=range("a","z");
$second=range("a","z");
$third=range("a","z");
$all_hash=array();

foreach ($first as $f){
foreach ($second as $s){
foreach ($third as $t){
$all_hash[$f.$s.$t] = true;
}
}
}
$all_arr = array_keys($all_hash);

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