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  1. <?php
  2. $str = '1377847,...,1447961';
  3. $str = explode(',',$str);
  4.  
  5. $first = $str[0];
  6. $third = trim($str[2]);
  7. $diff = $third - $first;
  8. $second = $first + $diff;
  9. print_r($second);
Success #stdin #stdout 0s 82880KB
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1447961
https://ideone.com/1JJeOT
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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