PHP login username and password verification program code

PHP login username and password verification program code_PHP tutorial

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Release： 2016-07-13 10:44:21

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A PHP username and password verification example program for login, friends who need to learn can refer to it.

, Verify the username and password entered by the user when logging in

The code is as follows

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代码如下

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/**
* Validator for Login.
*/
final class LoginValidator {

private function __construct() {

}

/**
* Validate the given username and password.
* @param $username and $password to be validated
* @return array array of {@link Error} s
*/
public static function validate($username, $password) {
$errors = array();
$username = trim($username);
if (!$username) {
$errors[] = new Error('username', '用户名不能为空。');
} elseif (strlen($username)<3) {
$errors[] = new Error('username', '用户名长度不能小于3个字符。');
} elseif (strlen($username)>30) {
            $errors[] = new Error('username', '用户名长度不能超过30个字符。');
        } elseif (!preg_match('/^[A-Za-z]+$/',substr($username, 0, 1))) {
            $errors[] = new Error('username', '用户名必须以字母开头。');
        } elseif (!preg_match('/^[A-Za-z0-9_]+$/', $username)) {
            $errors[] = new Error('username', '用户名只能是字母、数字以及下划线( _ )的组合。');
        } elseif (!trim($password)) {
            $errors[] = new Error('password', '密码不能为空。');
        } else {
            // check whether use exists or not
            $dao = new UserDao();
            $user = $dao->findByName($username);

            if ($user) {
                if (!($user->getPassword() == sha1($user->getSalt() . $password))) {
                    $errors[] = new Error('password', '用户名或密码错误。');
                }
            } else {
                $errors[] = new Error('username', '用户名不存在。');
            }
        }
        return $errors;
    }
}

<🎜>/**
* Validator for Login.
*/
final class LoginValidator {<🎜> <🎜> private function __construct() {

}<🎜> <🎜> /**
     * Validate the given username and password.
     * @param $username and $password to be validated
     * @return array array of {@link Error} s
    */
Public static function validate($username, $password) {
         $errors = array();
          $username = trim($username);
            if (!$username) {
               $errors[] = new Error('username', 'Username cannot be empty.');
            } elseif (strlen($username)<3) {
                $errors[] = new Error('username', 'The username cannot be less than 3 characters in length.');
            } elseif (strlen($username)>30) {
                 $errors[] = new Error('username', 'The username cannot exceed 30 characters in length.');
             } elseif (!preg_match('/^[A-Za-z]+$/',substr($username, 0, 1))) {
                $errors[] = new Error('username', 'Username must start with a letter.');
             } elseif (!preg_match('/^[A-Za-z0-9_]+$/', $username)) {
                  $errors[] = new Error('username', 'The username can only be a combination of letters, numbers and underscores (_).');
           } elseif (!trim($password)) {
               $errors[] = new Error('password', 'Password cannot be empty.');
          } else {
                         // check whether use exists or not
              $dao = new UserDao();
$user = $dao->findByName($username);                   if ($user) {
If (!($user->getPassword() == sha1($user->getSalt() . $password))) {
                   }
               } else {
                     $errors[] = new Error('username', 'Username does not exist.');
             }
         }
          return $errors;
}
} ?>

2、调用验证器进行验证

代码如下

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$username = null;
$password = null;

$msg = "";

if (isset($_POST['username']) && isset($_POST['password'])) {
    $username = addslashes(trim(stripslashes($_POST ['username'])));
    $password = addslashes(trim(stripslashes($_POST ['password'])));
    // validate
    $errors = LoginValidator::validate($username, $password);

    if (empty($errors)) {
        // save the latest ip or login time into database, then processing page forwarding
        $dao = new UserDao();
        $user = $dao->findByName($username);
        $last_login_ip = Utils::getIpAddress();
        $user->setLastLoginIp($last_login_ip);
        $now = new DateTime();
        $user->setLastLoginTime($now);
        $dao->save($user);
        UserLogin::setUserInfo($user);
        Flash::addFlash('登录成功！');
        Utils::redirect('welcome');
    }

    foreach ($errors as $e) {
        $msg .= $e->getMessage()."
";
    }