PHP - Creating a Session

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Introduction

To start a PHP session in your script, simply call the session_start() function.

If this is a new session, this function generates a unique SID for the session and sends it to the browser as a cookie called PHPSESSID (by default).

However, if the browser has sent a PHPSESSID cookie to the server because a session already exists, session_start() uses this existing session: 

session_start();

session_start() needs to send the PHPSESSID cookie in an HTTP header when it creates a session, you must call it before you output anything to the browser, much like you do with setcookie():

The following code generates a "Cannot send session cookie-headers already sent" warning, since 'Hi there!' is outputed first. 


Hi there!
 <?php
  session_start();
?>

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