What should I do if php SESSION cannot be passed across pages?

Methods to solve the problem that php SESSION cannot be passed across pages: 1. [session_start();] should be placed at the top of the page as much as possible; 2. [session: session_start();] must be manually turned on.

Methods to solve the problem that php SESSION cannot be passed across pages:

1, session_start(); It should be placed at the top of the page as much as possible;

2. If session Autostart is not configured in php.ini, you must manually open session: session_start before each session. ();

3. Session is a super global variable in PHP, just like $_GET, $_POST, $_SERVER, so it must be capitalized when used:

$_SESSION['username']=$username;

4. Cross-page transfer example: a.php page transfers $_SESSION['username'] to b.php:

a.php:

b.php:

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