php - Display possible combinations of string

Question

I am trying to take a string and display the possible combinations of it (in PHP), but while saying in order of each word. For example: "how are you" would return (an array)

How are you
How are
are you
how
you
are

The code I have now displays all combinations but I am wanting it to keep them in order and not flip words. Any one have any ideas or snippets they care to share? Thanks

Answer 1

Set two iterators and print everything between them. So something like this:

<?
$str = "How are you";
$words = explode(" ",$str);
$num_words = count($words);
for ($i = 0; $i < $num_words; $i++) {
  for ($j = $i; $j < $num_words; $j++) {
    for ($k = $i; $k <= $j; $k++) {
       print $words[$k] . " ";
    }
    print "
";
  }
}
?>

Output

---

How 
How are 
How are you 
are 
are you 
you