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?

Sudhir Bastakoti · Accepted Answer · 2013-01-20 07:20:41Z

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();
}

edited Jan 20, 2013 at 7:20

answered Jan 20, 2013 at 7:10

Sudhir Bastakoti

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3 Comments

heron1000 Over a year ago

That page says, "As of PHP 4.3.3, calling session_start() after the session was previously started will result in an error of level E_NOTICE. Also, the second session start will simply be ignored."

Sudhir Bastakoti Over a year ago

@Bryan as per your question, since you already have session_start() at top of page so if you have second session_start() somewhere in mid of page, that will get ignored and your previous session will resume..

Sudhir Bastakoti Over a year ago

but yes you'll get an error notice, since calling it multiple times does not make sense

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