PHP Session Cross-page Transfer session value loss problem

1, Session_Start (); should be placed at the top of the page as far as possible;2if there is no session autostart in the php.ini, the Session:session_start () must be opened manually before each conversation.3, SESSION is a super global variable inside PHP, like $_get,$_post,$_server, so use must capitalize: $_session['username']=$username;4, cross-page Delivery Example: a.php page Delivery $_session['username'] to b.php:a.php--------------<?php session_start (); Open session $username=$_post['username']; Receive variable $_session['username']=$username;//Save variable to session?>b.php
--------------<?php session_start (); Open session (Here the session does not open, is not to get the value of the session) Echo $_session['username']; Output the variables in the session?>

PHP Session Cross-page Transfer session value loss problem