The warning "Invalid path" in Codeigniter

The error message you're encountering indicates that there's a problem with the mkdir() function call in your PHP application, specifically in the Session_files_driver.php file at line 137. The warning "Invalid path" suggests that the path being passed to mkdir() is either invalid, malformed, or inaccessible.

Here are steps you can take to troubleshoot and resolve this issue:

1. Check the Path:

   • Go to the code around line 137 in Session_files_driver.php and look at the path being used in the mkdir() function.
   • Ensure that the path is correctly formatted and accessible.

2. Define Session Save Path:

   • It's possible that the session save path is not set correctly in your PHP configuration or in your application code.
   • You can check the session save path in your PHP configuration file (php.ini):

5. • $path = 'path/to/session/directory';
     if (!file_exists($path)) {
         if (!mkdir($path, 0777, true)) {
             error_log("Failed to create directory: $path");
         }
     }
         

6. Error Logging:

   • Since PHP errors are logged, you may want to enable detailed error logging and check for additional clues in your PHP error logs.

Once you make these adjustments, re-test your application to see if the error persists. If it does, return to the code and examine any further details provided in error logs or console output to continue troubleshooting.