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What is the difference between session_unset() and session_destroy() in PHP?
What is the best for security, and if the session is unset are load times better the next time the session has to accessed rather than recreated?
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session_destroy() function: It destroys all of the data associated with the current session. It does not unset any of the global variables associated with the session, or unset the session cookie. session_unset() function: It deletes only the variables from session and session still exists. Only data is truncated.
A PHP session can be destroyed by session_destroy() function. This function does not need any argument and a single call can destroy all the session variables. If you want to destroy a single session variable then you can use unset() function to unset a session variable.
session_unset just remove all session variables.
Unset will destroy a particular session variable whereas session_destroy() will destroy all the session data for that user.
It really depends on your application as to which one you should use. Just keep the above in mind.
unset($_SESSION['name']); // will delete just the name data session_destroy(); // will delete ALL data associated with that user. Something to be aware of, the $_SESSION variables are still set in the same page after calling session_destroy() where as this is not the case when using unset($_SESSION) or $_SESSION = array(). Also, unset($_SESSION) blows away the $_SESSION superglobal so only do this when you're destroying a session.
With all that said, it's best to do like the PHP docs has it in the first example for session_destroy().
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