php session detection and logout_PHP tutorial

Copy code The code is as follows:

session_start();
$_SESSION['username'] ="zhuzhao";
?>

Copy code The code is as follows:

< ;?php
session_start();
unset($_SESSION['username']);
if(isset($_SESSION['username']))
echo "username already exists";
else
echo "username does not exist";
?>

http://www.bkjia.com/PHPjc/319897.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/319897.htmlTechArticleCopy the code as follows: ?php session_start(); $_SESSION['username']="zhuzhao"; ? Copy the code as follows: ?php session_start(); unset($_SESSION['username']); if(isset($_SESSIO...