algorithm that will take numbers or words and find all possible combinations

by

Take a look at http://pear.php.net/package/Math_Combinatorics

<?php
require_once 'Math/Combinatorics.php';
$words = array('cat', 'dog', 'fish');
$combinatorics = new Math_Combinatorics;
foreach($combinatorics->permutations($words, 2) as $p) {
  echo join(' ', $p), "\n"; 
}

prints

cat dog
dog cat
cat fish
fish cat
dog fish
fish dog

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