PHP - session_start（）

Question

I have a PHP page that has session_start() at the very top. Halfway through the page, if a certain condition is met, the page is reloaded using JavaScript. I'm wondering if session_start() is called again when the page is reloaded or does PHP know to skip it since the session has already started?

Answer 1

session_start — Start new or resume existing session. Starts a new session if not started else resumes the existing session.

Added You could check and initiate, like:

if (session_id() == "") {
    session_start();
}