gistfile1.txt

php > preg_match_all("#(\w+)#",'zażółć gęślą jaźń',$a); var_dump($a);
array(2) {
  [0]=>
  array(4) {
    [0]=>
    string(2) "za"
    [1]=>
    string(1) "g"
    [2]=>
    string(1) "l"
    [3]=>
    string(2) "ja"
  }
  [1]=>
  array(4) {
    [0]=>
    string(2) "za"
    [1]=>
    string(1) "g"
    [2]=>
    string(1) "l"
    [3]=>
    string(2) "ja"
  }
}