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  • Code to validate ISBN10 or ISBN13

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    We seldom need a code to check whether the ISBN of book we are trying to search is a valid ISBN or not. So as to validate a provided ISBN we can use the below code for ISBN10 and ISBN13 respectively :

    Code for checking validity of ISBN10 :

    function isValidIsbn10($isbn){
        if(strlen($isbn)!==10) return false;
        $check = 0;
        for ($i = 0; $i < 10; $i++) {
          if ('x' === strtolower($isbn[$i])) {
              $check += 10 * (10 - $i);
          } elseif (is_numeric($isbn[$i])) {
              $check += (int)$isbn[$i] * (10 - $i);
          } else {
              return false;
          }
        }
        return (0 === ($check % 11)) ? 1 : false;
    } 

    Code for checking validity of ISBN13 :

    function isValidIsbn13($isbn){
        if(strlen($isbn)!==13) return false;
        $check = 0;
        for ($i = 0; $i < 13; $i += 2) {
          $check += (int)$isbn[$i];
        }
        for ($i = 1; $i < 12; $i += 2) {
          $check += 3 * $isbn[$i];
        }
        return (0 === ($check % 10)) ? 2 : false;
    }

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