编辑代码

<?php
session_start();
$_SESSION['name'] = 'jobs';
//在这里删除name的session值
echo "=0=".PHP_EOL;
$result = session_id();
echo $result.PHP_EOL;
echo var_dump($result).PHP_EOL;
$id = session_id();
session_destroy();
echo "=1=".PHP_EOL;
$result = session_id();
echo "$id--".session_id($id)."判断变量是否存在".var_dump($result).",想必啥都没打印".PHP_EOL;
echo "=2=".PHP_EOL;
echo session_id();
var_dump($_SESSION);//虽然session会话结束，但是全局变量$_SESSION还在
if (isset($_SESSION['name'])) {
    echo "=3=".PHP_EOL;
    echo $_SESSION['name'];
}