thinkphp How to implement the login Exit function

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<?php/** * User Login and Exit * After successful registration, the page will be redirected to the login login page * When the data is submitted to the landing page, the verification code must be executed before the login operation */public function Checkyzm ($yzm) {$verif Y=new \think\verify ();//Instantiate the Verify method with TP if ($verify->check ($YZM)) {//Call the Check method return true;}  else{echo ' Verification code error '; Exit (); }}public function Login () {if (!is_post) {$this->display ();}   else{//If verification code is verified via if ($this->checkyzm (' Post.yzm ')) {$username =i (' post.username ');   $user =d (' user ')->where ("Username= ' $username '")->find (); Post the password splicing salt MD5 after the password = database password, then through if (MD5 (I (' Post.password '). $user [' salt ']) = = = $user [' Password ']{cookies   (' username ', $userp [' username ']);//write Cookie $this->redirect ('/');//Jump to Home}else{echo ' username or password is incorrect '; }}}}/**V Layer * Exit Login * Read cookie $Think. cookie *///without cookie data Hello Welcome to <if condition= "$Think. Cookie.username eq Null" >&lt A href= "{: U (' Home/user/login ')}" rel= "external nofollow" rel= "external nofollow" style= "color: #50884b" > Login </a > |<a href= "{: U (' Home/user/reg ')}" rel= "ExternaL nofollow "style=" color: #50884b "> Free registration </a> |<else/>{$Think. Cookie.username}|<<a href=" {: U (' Home/user/login ')} "rel=" external nofollow "rel=" external nofollow "style=" color: #50884b "> Exit </a> </if >/** * Exit method * 1,cookie set to NULL, delete cookie * 2.  Jump to Homepage */Public Function logout () {cookie (' username ', null); $this->redirect ('/'); };

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