分享一个验证身份号函数：

function validateIdCard($value){    if (!preg_match('/^\d{17}[0-9xX]$/', $value)) { //基本格式校验        return false;    }    $parsed = date_parse(substr($value, 6, 8));    if (!(isset($parsed['warning_count'])         && $parsed['warning_count'] == 0)) { //年月日位校验        return false;    }    $base = substr($value, 0, 17);    $factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];    $tokens = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];    $checkSum = 0;    for ($i=0; $i<17; $i++) {        $checkSum += intval(substr($base, $i, 1)) * $factor[$i];    }    $mod = $checkSum % 11;    $token = $tokens[$mod];    $lastChar = strtoupper(substr($value, 17, 1));    return ($lastChar === $token); //最后一位校验位校验}