line 18: // Set a variable in a current session...
line 46: // Get a variable from current session...
line 80: // Get a current session string (EXAMPLE: PHPSESSID=b188e8c9c45b347cdded2)...
line 89: // Get current session ID (EXAMPLE: whatever=b188e8c9c45b347cdded2)...
line 97: // Unset a current session variable...
line 128: // Unset every variable in the current session...
line 154: // This will delete your current session and delete every session variable created...
line 163: // Display all variables in a current session...
line 168: echo 'Variables set in current session:<br>';...

line 1: This checks the name of the PHP file currently executing....