What is the default behavior of session.cookie_lifetime when set to 0 in PHP sessions?

Setting session.cookie_lifetime to 0 in PHP sessions means that the session cookie will expire when the browser is closed. This is the default behavior for PHP sessions. To ensure that the session cookie expires when the browser is closed, you can explicitly set session.cookie_lifetime to 0 in your PHP code. 

// Set session cookie lifetime to 0 for it to expire when the browser is closed
ini_set('session.cookie_lifetime', 0);

// Start the session
session_start();

// Your PHP code here

Keywords

PHP session cookie_lifetime default behavior 0

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