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  1. <?php
  2.  
  3. // your code goes here
  4. $x = 'здравствуй мир';
  5. $results = [];
  6. preg_match_all('/./u', $x, $results);
  7. var_dump($results);
Success #stdin #stdout 0.02s 26128KB
stdin
Standard input is empty
stdout
array(1) {
  [0]=>
  array(14) {
    [0]=>
    string(2) "з"
    [1]=>
    string(2) "д"
    [2]=>
    string(2) "р"
    [3]=>
    string(2) "а"
    [4]=>
    string(2) "в"
    [5]=>
    string(2) "с"
    [6]=>
    string(2) "т"
    [7]=>
    string(2) "в"
    [8]=>
    string(2) "у"
    [9]=>
    string(2) "й"
    [10]=>
    string(1) " "
    [11]=>
    string(2) "м"
    [12]=>
    string(2) "и"
    [13]=>
    string(2) "р"
  }
}