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<?php
$splitby = array('these','are','the','words','to','split','by');
$text = 'This is the string which needs to be split by the above words.';
$pattern = '/\s?'.implode($splitby, '\s?|\s?').'\s?/';
$result = preg_split($pattern, $text, -1, 1 /*PREG_SPLIT_NO_EMPTY*/);
var_dump($result);
?>

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• # 1:   hide show   clone   input   562 days 17 hours ago    Success

  result: Success     time: 0s    memory: 13112 kB     returned value: 0

  input: no
  output:

  array(5) {
    [0]=>
    string(7) "This is"
    [1]=>
    string(18) "string which needs"
    [2]=>
    string(2) "be"
    [3]=>
    string(5) "above"
    [4]=>
    string(1) "."
  }