---- EXPECTED OUTPUT
sub-key 'non_existent' is not set.
sub-key 1 is set: string(1) "o"
-------------------
sub-sub-key 'sub_sub' is not set.
sub-sub-key 0 is set: string(1) "o"
-------------------
sub-key 'non_existent' is empty.
sub-key 1 is not empty: string(1) "o"
-------------------
sub-sub-key 'sub_sub' is empty.
sub-sub-key 0 is not empty: string(1) "o"
DONE
---- ACTUAL OUTPUT
Usage: php
      php -[b|c|n|h|i|q|s|v|?] [<file>] [args...]
  Run in LSAPI mode, only '-b', '-s' and '-c' are effective
  Run in Command Line Interpreter mode when parameters are specified

  -b <address:port>|<port> Bind Path for external LSAPI Server mode
  -c <path>|<file> Look for php.ini file in this directory
  -n    No php.ini file will be used
  -h    This help
  -i    PHP information
  -l    Syntax check
  -q    Quiet-mode.  Suppress HTTP Header output.
  -s    Display colour syntax highlighted source.
  -v    Version number
  -?    This help

  args...    Arguments passed to script.
---- FAILED