'PHP $_SESSION preventing or blocking website load

I have a simple page to check if the session are set or no

session_start();
if (!isset($_SESSION['id'])) {
    $_SESSION['checkin'] = 'yes';
    header("Location: https://blabla.php");
    exit();
} else {
    // do something here
}


<HTM>
web page
</HTML>

everytime i the session is not set, i would not load the page. i have try to delete the exit() funciton, page load correctly, but i cannot redirect it to the url

EDIT :

I am forget to write session_start(); here, but in my real code, they already inputed

phpsession


Solution 1:[1]

It is likely that you have a non-header output before the header line. Try adding an ob_start() after the session_start().

Sources

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Source: Stack Overflow

Solution Source
Solution 1 AndreC23

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