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  1. <?php
  2. $arr = [[1, 9, 9, 5], [1, 9, 9, 6], [1, 9, 9, 7], [1, 9, 9, 8]];
  3. $arr = array_map('implode', $arr);
  4.  
  5. var_dump($arr);
Success #stdin #stdout 0.02s 23580KB
stdin
Standard input is empty
stdout
array(4) {
  [0]=>
  string(4) "1995"
  [1]=>
  string(4) "1996"
  [2]=>
  string(4) "1997"
  [3]=>
  string(4) "1998"
}