How to check if php session is already started or not

0 votes

Hii,

When I have session_start() on this script I sometimes get the error message for "session already started". For that I've put these lines:

if(!isset($_COOKIE["PHPSESSID"]))
{
  session_start();
}

but this time I got this warning message:

Notice: Undefined variable: _SESSION

Is there a better way to check if session has already started?

Apr 1, 2020 in PHP by kartik
• 37,520 points
5,739 views

1 answer to this question.

0 votes

Hello kartik,

Use session_id(), it returns an empty string if not set. It's more reliable than checking the $_COOKIE.

if (strlen(session_id()) < 1) {
    session_start();
}

Addition: For all php version

if ((function_exists('session_status') 
  && session_status() !== PHP_SESSION_ACTIVE) || !session_id()) {
  session_start();
}

Thank You!!

answered Apr 1, 2020 by Niroj
• 82,840 points

Related Questions In PHP

0 votes
0 answers

How to check if PHP array is associative or sequential?

Can someone please suggest to me an ...READ MORE

Jun 14, 2022 in PHP by narikkadan
• 63,600 points
664 views
0 votes
1 answer

How to check if the request is an AJAX request with PHP?

Hello @kartik, Try below code snippet if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) ...READ MORE

answered Oct 29, 2020 in PHP by Niroj
• 82,840 points
12,817 views
0 votes
1 answer

How to check if a string is an email address in PHP?

Hello, Try this without regular expressions: <?php ...READ MORE

answered Nov 3, 2020 in PHP by Niroj
• 82,840 points
3,979 views
0 votes
1 answer

How do check if a PHP session is empty?

Hii, I would use isset and empty: session_start(); if(isset($_SESSION['blah']) && !empty($_SESSION['blah'])) { ...READ MORE

answered Nov 9, 2020 in PHP by Niroj
• 82,840 points
9,616 views
+1 vote
1 answer

How to make anchor tag with routing using Laravel?

Hey @kartik, First you have to go to ...READ MORE

answered Mar 18, 2020 in Laravel by Niroj
• 82,840 points
23,054 views
0 votes
1 answer

What is redirection in Laravel?

Named route is used to give specific ...READ MORE

answered Mar 18, 2020 in Laravel by Niroj
• 82,840 points
3,012 views
0 votes
1 answer

How to install Laravel via composer?

Hello, This is simple you just need to ...READ MORE

answered Mar 23, 2020 in Laravel by Niroj
• 82,840 points
2,936 views
+1 vote
1 answer

What are named routes in Laravel and How can specify route names for controller actions?

Hey @kartik, Named routing is another amazing feature of ...READ MORE

answered Mar 23, 2020 in Laravel by Niroj
• 82,840 points
44,845 views
0 votes
1 answer

How to check if a string is JSON or not?

Hello @kartik, Use JSON.parse function isJson(str) { ...READ MORE

answered Aug 19, 2020 in PHP by Niroj
• 82,840 points
9,126 views
0 votes
1 answer

How to check if memcache or memcached is installed for PHP?

Hii, You can look at phpinfo() or check ...READ MORE

answered Nov 6, 2020 in PHP by Niroj
• 82,840 points
4,997 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP