How to check if session exists globally using codeigniter?

@adan 

In CodeIgniter, you can check if a session exists globally by accessing the session object and checking if the specific session variable is set. Here is an example code to check if a specific session variable exists globally:

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// Get the CodeIgniter instance
$CI =& get_instance();

// Check if the session data is set
if ($CI->session->has_userdata('user_id')) {
    // Session exists
    echo 'Session exists!';
} else {
    // Session does not exist
    echo 'Session does not exist!';
}

In the above code, we are accessing the session object using the $CI->session syntax, and then using the has_userdata() method to check if a specific session variable called 'user_id' exists. You can replace 'user_id' with any session variable you want to check for existence.

Make sure that you have loaded the session library in your controller or autoload file before using this code snippet.