PHP 验证身份证号码

/**
 * 验证身份证号码
 *
 * @param string $vStr
 * @return boolean
 */
function verifyCard( $vStr ) {
    $vCity = array(‘11‘, ‘12‘, ‘13‘, ‘14‘, ‘15‘, ‘21‘, ‘22‘, ‘23‘, ‘31‘, ‘32‘, ‘33‘, ‘34‘, ‘35‘, ‘36‘, ‘37‘, ‘41‘, ‘42‘, ‘43‘, ‘44‘, ‘45‘, ‘46‘, ‘50‘, ‘51‘, ‘52‘, ‘53‘, ‘54‘, ‘61‘, ‘62‘, ‘63‘, ‘64‘, ‘65‘, ‘71‘, ‘81‘, ‘82‘, ‘91‘);
    if (!preg_match(‘/^[1-9]\d{5}(18|19|20|(3\d))\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/‘, $vStr)) return false;
    if (!in_array(substr($vStr, 0, 2), $vCity)) return false;
    $vStr = preg_replace(‘/[xX]$/i‘, ‘a‘, $vStr);
    $vLength = strlen($vStr);
    if ($vLength == 18) {
        $vBirthday = substr($vStr, 6, 4) . ‘-‘ . substr($vStr, 10, 2) . ‘-‘ . substr($vStr, 12, 2);
    } else {
        $vBirthday = ‘19‘ . substr($vStr, 6, 2) . ‘-‘ . substr($vStr, 8, 2) . ‘-‘ . substr($vStr, 10, 2);
    }
    if (date(‘Y-m-d‘, strtotime($vBirthday)) != $vBirthday) return false;
    if ($vLength == 18) {
        $vSum = 0;
        for ($i = 17; $i >= 0; $i--) {
            $vSubStr = substr($vStr, 17 - $i, 1);
            $vSum += (pow(2, $i) % 11) * (($vSubStr == ‘a‘) ? 10 : intval($vSubStr, 11));
        }
        if ($vSum % 11 != 1) return false;
    }
    return true;
}