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  1. <?php
  2. function ncd($x, $y) { 
  3.   $cx = strlen(gzcompress($x));
  4.   $cy = strlen(gzcompress($y));
  5.   return (strlen(gzcompress($x . $y)) - min($cx, $cy)) / max($cx, $cy);
  6. }   
  7.  
  8. echo (ncd('this is a test', 'this was a test'));
  9. echo (ncd('this is a test', 'this text is completely different'));
  10. ?>
Success #stdin #stdout 0.02s 13112KB
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0.3043478260870.74358974359
https://ideone.com/BdpZs
language:
PHP (php 7.3.5)
created:
14 years ago
visibility:
public

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