[cd34]

$type would need to have more than a true/false value.

you could do something like

switch ($type) {
  case 0: 
     $sentence = "$word1[0] $word2[0] $word3[0] $word4[0]";
     break;
  case 1: 
    $sentence = "$word1[0] $word2[0] $word3[0] $word4[0] $word5[0]";
    break;
  case 2:
    asdfhaskdhflasjdhflashdf
    break;
  default:
     asdjhflasjhdfljashdflkjhasdf
     break;
}

Then you just have to set $type to something other than 0/1 or false/true.