PHP VIN number validation code

Here's something I wrote up real quick using the example in the wikipedia article.

Not guaranteed perfect or bug free or super efficient, but should provide you with a solid starting point:

Note: I included the edits provided by Confluence below, making the procedure slightly more succinct.

function validate_vin($vin) {

    $vin = strtolower($vin);
    if (!preg_match('/^[^\Wioq]{17}$/', $vin)) { 
        return false; 
    }

    $weights = array(8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2);

    $transliterations = array(
        "a" => 1, "b" => 2, "c" => 3, "d" => 4,
        "e" => 5, "f" => 6, "g" => 7, "h" => 8,
        "j" => 1, "k" => 2, "l" => 3, "m" => 4,
        "n" => 5, "p" => 7, "r" => 9, "s" => 2,
        "t" => 3, "u" => 4, "v" => 5, "w" => 6,
        "x" => 7, "y" => 8, "z" => 9
    );

    $sum = 0;

    for($i = 0 ; $i < strlen($vin) ; $i++ ) { // loop through characters of VIN
        // add transliterations * weight of their positions to get the sum
        if(!is_numeric($vin{$i})) {
            $sum += $transliterations[$vin{$i}] * $weights[$i];
        } else {
            $sum += $vin{$i} * $weights[$i];
        }
    }

    // find checkdigit by taking the mod of the sum

    $checkdigit = $sum % 11;

    if($checkdigit == 10) { // checkdigit of 10 is represented by "X"
        $checkdigit = "x";
    }

    return ($checkdigit == $vin{8});
}

Note: there is a small percent error with verifying VINs because of the nature of the checksum:

...a match does not prove the VIN is correct, because there is still a 1 in 11 chance of any two distinct VINs having a matching check digit.

Also note: 11111111111111111 will validate against the procedure above. Whether or not you want to check for that is up to you:

Straight-ones (seventeen consecutive '1's) will suffice the check-digit. This is because a value of one, multiplied against 89 (sum of weights), is still 89. And 89 % 11 is 1, the check digit. This is an easy way to test a VIN-check algorithm.

reference: http://en.wikipedia.org/wiki/Vehicle_identification_number#Check_digit_calculation

Here's a version of the code by jordan ported to Javascript, hope it's helpful to someone...

function validate_vin(vin)
{
  function isnumeric(mixed_var) {
    return (typeof(mixed_var) === 'number' || typeof(mixed_var) === 'string') && mixed_var !== '' && !isNaN(mixed_var);
  }
  var pattern = /^[^\Wioq]{17}$/;
  var weights = Array(8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2);
  var transliterations = {
    "a" : 1, "b" : 2, "c" : 3, "d" : 4,
    "e" : 5, "f" : 6, "g" : 7, "h" : 8,
    "j" : 1, "k" : 2, "l" : 3, "m" : 4,
    "n" : 5, "p" : 7, "r" : 9, "s" : 2,
    "t" : 3, "u" : 4, "v" : 5, "w" : 6,
    "x" : 7, "y" : 8, "z" : 9
  };

  vin = vin.toLowerCase();
  if(!vin.match(pattern)) { return false; }

  var sum = 0;
  for(var i=0; i<vin.length; i++) {
    if(!isnumeric(vin.charAt(i))) {
      sum += transliterations[vin.charAt(i)] * weights[i];
    } else {
      sum += parseInt(vin.charAt(i)) * weights[i];
    }  
  }

  var checkdigit = sum % 11;
  if(checkdigit == 10) { // check digit of 10 represented by X
    checkdigit = 'x';
  }

  return (checkdigit == vin.charAt(8));
}

It's "VIN." "VIN Number" = "Vehicle Identification Number Number," which doesn't make sense.

You can see a definition of the structure of VINs here:
http://en.wikipedia.org/wiki/Vehicle_identification_number

And you can work from there, or you can grab this script here:
http://www.geekpedia.com/code29_Check-if-VIN-number-is-valid.html

---

Here is an improved version of the function posted by jordan:

$vin = "1M8GDM9AXKP042788";

function validate_vin($vin) {

    $vin = strtolower($vin);
    if (!preg_match('/^[^\Wioq]{17}$/', $vin)) { 
        return false; 
    }

    $weights = array(8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2);

    $transliterations = array(
        "a" => 1, "b" => 2, "c" => 3, "d" => 4,
        "e" => 5, "f" => 6, "g" => 7, "h" => 8,
        "j" => 1, "k" => 2, "l" => 3, "m" => 4,
        "n" => 5, "p" => 7, "r" => 9, "s" => 2,
        "t" => 3, "u" => 4, "v" => 5, "w" => 6,
        "x" => 7, "y" => 8, "z" => 9
    );

    $sum = 0;

    for($i = 0 ; $i < strlen($vin) ; $i++ ) { // loop through characters of VIN
        // add transliterations * weight of their positions to get the sum
        if(!is_numeric($vin{$i})) {
            $sum += $transliterations[$vin{$i}] * $weights[$i];
        } else {
            $sum += $vin{$i} * $weights[$i];
        }
    }

    // find checkdigit by taking the mod of the sum

    $checkdigit = $sum % 11;

    if($checkdigit == 10) { // checkdigit of 10 is represented by "X"
        $checkdigit = "x";
    }

    return ($checkdigit == $vin{8});
}