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PL VATID validator

/ Published in: PHP
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  1. function is_valid_nip($nip_number)
  2. {
  3.   $nip_digits  = array_filter(preg_split('//', $nip_number, -1, PREG_SPLIT_NO_EMPTY), 'is_numeric');
  4.   $nip_length  = count($nip_digits);
  5.   $nip_sum     = 0;
  6.  
  7.   if(10 != $nip_length)
  8.   { return false; }
  9.  
  10.   foreach(array(6, 5, 7, 2, 3, 4, 5, 6, 7) as $weight)
  11.   { $nip_sum += $weight * array_shift($nip_digits); }
  12.  
  13.   return (($nip_sum % 11) == array_shift($nip_digits));
  14. }

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