Design Pattern--Observer Pattern_PHP Tutorial

[php]
/*
Consider the following scenario:
Wrong password once, reminder to log in again
2 errors, verification code appears
If you make 5 mistakes, the verification code becomes complicated
10 mistakes, the account will be locked

Conventional ideas:

When it is determined that the username/password does not match {

If(wrong) {
Number of times +1
}

If (number of times == 1) {
} else if(number of times==2){
} else {
}....
....

This is obviously unreasonable

}



Determine whether the username/password is correct or not. This belongs to the login category
Login success/failure, reward/punishment, belongs to the reward and punishment category.

*/


interface Observer {
Function update($obj);
}


interface Post {
Function attach($key,$obj);
Function detach($key);

function noticefy();
}

class User implements Post {
Public $state = null;
Public $lastlogin = 0;

protected $observers = array();

Public function attach($key,$obj) {
           $this->observers[$key] = $obj;
}  

Public function detach($key) {
          unset($this->observers[$key]);
}  

Public function noticefy() {
foreach($this->observers as $obj) {
$obj->update($this);
         } 
}  

Public function Login() {
             $this->state = rand(0,1); // Returning 0 means the username/password is wrong; Returning 1 means the login is successful
                                   
                    // Notify all objects that are listening for me                                                                               $this->noticefy();

                                   
Return $this->state;
}  
}


class Log implements Observer{
Public function update($obj) {
// Log analysis
              echo $obj->state?'Add 1 point, record': 'Wrong 1 time, record and analyze';
echo '
';
}  
}

class Biz implements Observer{
Public function update($obj) {
echo (time() - $obj->lastlogin) > 1000?'Long time no see':'Quality customer';
}  
}



$user = new User();
$log = new log();
$biz = new Biz();

$user->attach('log',$log);
$user->attach('biz',$biz);


//======It’s about the client======//

for($i=1;$i<10;$i++) {
$user->login();
echo '

Consider the following scenario:
Wrong password once, reminder to log in again
2 errors, verification code appears
If you make 5 mistakes, the verification code becomes complicated
10 mistakes, the account will be locked

Number of times +1
}

} else if(number of times==2){
} else {
}....
....

Determine whether the username/password is correct or not. This belongs to the login category
Login success/failure, reward/punishment, belongs to the reward and punishment category.

*/

interface Observer {
Function update($obj);
}

interface Post {
Function attach($key,$obj);
Function detach($key);

function noticefy();
}

class User implements Post {
Public $state = null;
Public $lastlogin = 0;

protected $observers = array();

public function attach($key,$obj) {
           $this->observers[$key] = $obj;
}

public function detach($key) {
          unset($this->observers[$key]);
}

public function noticefy() {
foreach($this->observers as $obj) {
$obj->update($this);
}
}

public function Login() {
             $this->state = rand(0,1); // Returning 0 means the username/password is wrong; Returning 1 means the login is successful
                         
                   // Notify all objects that are listening for me
$this->noticefy();

 
          return $this->state;
}
}

class Log implements Observer{
Public function update($obj) {
// Log analysis
              echo $obj->state?'Add 1 point, record': 'Wrong 1 time, record and analyze';
echo '
';
}
}

class Biz implements Observer{
Public function update($obj) {
echo (time() - $obj->lastlogin) > 1000?'Long time no see':'Quality customer';
}
}

$user = new User();
$log = new log();
$biz = new Biz();

$user->attach('log',$log);
$user->attach('biz',$biz);

//======It’s about the client=====//

for($i=1;$i<10;$i++) {
$user->login();
echo '