The PHP function to check Thai national ID

thai_national_id_validation.php

/**
* Validate Thai national ID
* @param string $nationalId
* @link https://th.wikipedia.org/wiki/เลขประจำตัวประชาชนไทย
* @return bool
*/
public function isValidNationalId(string $nationalId)
{
  if (strlen($nationalId) === 13) {
    $digits = str_split($nationalId);
    $lastDigit = array_pop($digits);
    $sum = array_sum(array_map(function($d, $k) {
      return ($k+2) * $d;
    }, array_reverse($digits), array_keys($digits)));
    return $lastDigit === strval((11 - $sum % 11) % 10);
  }
  return false;
}