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  1. <?php
  2.  
  3. $data = '[
  4.  ["11.09.2018","222"],
  5.  ["12.09.2018","392"],
  6.  ["13.09.2018","485"],
  7.  ["14.09.2018","449"],
  8.  ["15.09.2018","449"],
  9.  ["16.09.2018","467"]
  10. ]';
  11.  
  12. $data = json_decode($data);
  13. $data = array_column($data, 1);
  14.  
  15. $result = [];
  16. for($i = 1, $size = count($data); $i < $size; ++$i) {
  17. 	$result[$i] = $data[$i] - $data[$i - 1];
  18. }
  19. print_r($result);
Success #stdin #stdout 0s 82560KB
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stdin
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Standard input is empty
stdout
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Array
(
    [1] => 170
    [2] => 93
    [3] => -36
    [4] => 0
    [5] => 18
)
https://ideone.com/ZGf0iR
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
secret

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