Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0 
#0 [internal function]: __error(2, 'Unknown: write ...', 'Unknown', 0, NULL)
#1 {main}

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/sessions) in Unknown on line 0 
#0 [internal function]: __error(2, 'Unknown: Failed...', 'Unknown', 0, NULL)
#1 {main}