How can I log out of html and php?

Log out of html and php & lt; p & gt; & lt; h2 & gt; welcome & lt;/h2 & gt; & lt;/p & gt; & amp; nbsp; & amp; nbsp; & lt; ahref = & quot ;.. /index. php & quot; & gt; logout & lt;/a & gt; when clicked, the logon page is displayed and the session is logged out. & lt ;? Php & n logout html and php

Welcome

Click logout to go to the logon page and log out the session.
Unset ($ _ SESSION ['login']);
Session_destory ();
?>
Where should this section be stored?

------ Solution --------------------
Session_start ();
Unset ($ _ SESSION ['login']);
Session_destory ();
................
------ Solution --------------------
Of course, it is on the logout target page
------ Solution --------------------
Cancel a connection address
Cancel
Write in unset. php
Unset ($ _ SESSION ['login']);
Session_destory ();
?>