$words = array('red', 'blue', 'green');
$num = count($words);
//The total number of possible combinations
$total = pow(2, $num);
//Loop through each possible combination
for ($i = 0; $i < $total; $i++) {
//For each combination check if each bit is set
for ($j = 0; $j < $total; $j++) {
//Is bit $j set in $i?
if (pow(2, $j) & $i) echo $words[$j] . ' ';
}
echo '<br />';
}
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