在第一次和第二次请求期间，此PHP代码的输出是什么？
问题描述：
This is most likely a PHP noobie question.
To test some server caching configuration, I added the following code to my test suite:
<?php
if (array_key_exists('visited', $GLOBALS))
{
print_r("We have already met");
} else {
print_r("Hello ShimmerCat");
}
$GLOBALS['visited']=1;
?>
I'm expecting this code to take differents path of the branch during a first and second request, but it is returning the second message always. How can I achieve what I want?
答
PHP itself is stateless, meaning every time a user visits a PHP page, the whole operation is done from scratch with each variable being defined as in the script.
If you want to store data between views, the basic way is with cookies. If you want the details of what's remembered to be secure, use session cookies.