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  1. <?php
  2. $arr = [[1, 9, 9, 5], [1, 9, 9, 6], [1, 9, 9, 7], [1, 9, 9, 8]];
  3.  
  4. foreach ($arr as $key => $value) {
  5. 	$val = implode($value);
  6. 	$arr[$key] = $val;
  7. }
  8.  
  9. var_dump($arr);
Success #stdin #stdout 0.02s 23828KB
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Standard input is empty
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array(4) {
  [0]=>
  string(4) "1995"
  [1]=>
  string(4) "1996"
  [2]=>
  string(4) "1997"
  [3]=>
  string(4) "1998"
}
https://ideone.com/X6vueO
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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