PHP | How to destroy session?

On +Wizpert, Someone asked me that how to destroy session?
Session is used for specific purpose. like

• Login user
• Review creation
• Forms Creation
• Check Out system
• And more

In this code you will learn, How to destroy session on logout click?

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 <?php  
 $_SESSION = array(); // Oh Sorry here you need to null all sessions  
 setcookie(session_name(), '', time()-60); // here you will set cookies time back to age. like time()-60 mean . 1 minute before now.  
 session_destroy(); // here you will delete session  
 header("Location: login.php"); // here you will be reallocated to login.php page.  
 exit; // page code will be exit.  
 ?>  

I hope this can help you.