How can the error "Session already started" be resolved in PHP?

To resolve the error "Session already started" in PHP, you can check if a session is already active before starting a new one using the session_status() function. If the session is already active, you can simply use session_id() to retrieve the current session ID. 

if (session_status() == PHP_SESSION_NONE) {
    session_start();
} else {
    session_id($_COOKIE['PHPSESSID']);
    session_start();
}

Keywords

session_start session headers_sent ob_start output buffering

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