Search results for: "variable references"

How can PHP be used to determine which users are currently logged in and display this information in a list?

To determine which users are currently logged in, we can store the user's login status in a database or session variable when they log in and remove i...

How does the use of register_globals impact PHP scripts and what are the potential pitfalls associated with it?

When register_globals is enabled in PHP, it automatically creates global variables from form input, cookies, and server variables. This can lead to se...

What are the limitations of using PHP authentication when running it as a CGI?

When running PHP as a CGI, one limitation is that the $_SERVER['PHP_AUTH_USER'] and $_SERVER['PHP_AUTH_PW'] variables may not be available for basic H...

Is there a maximum character limit for session variables in PHP, and how does it impact storing navigation data?

Session variables in PHP have a default maximum character limit of 4096 bytes. If navigation data exceeds this limit, it can cause issues with storing...

What are the potential pitfalls of using session_is_registered() in PHP?

Using session_is_registered() is not recommended in PHP as it has been deprecated since PHP 5.3.0 and removed in PHP 5.4.0. Instead, it is advised to...