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  1. <?php
  2. // original string
  3. $str = ",a,b,c,,,d,,";
  4.  
  5. // now clean it
  6. $str = preg_replace('/,{2,}/', ',', trim($str, ','));
  7.  
  8. // and see it
  9. var_dump($str);
Success #stdin #stdout 0.01s 20520KB
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Standard input is empty
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string(7) "a,b,c,d"
https://ideone.com/52NoE6
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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