---- EXPECTED OUTPUT
is_a(base, base) = yes
is_a(base, derived_a) = no
is_a(base, derived_b) = no
is_a(base, derived_c) = no
is_a(base, derived_d) = no
is_a(base, if_a) = no
is_a(base, if_b) = no

is_a(derived_a, base) = yes
is_a(derived_a, derived_a) = yes
is_a(derived_a, derived_b) = no
is_a(derived_a, derived_c) = no
is_a(derived_a, derived_d) = no
is_a(derived_a, if_a) = yes
is_a(derived_a, if_b) = no

is_a(derived_b, base) = yes
is_a(derived_b, derived_a) = no
is_a(derived_b, derived_b) = yes
is_a(derived_b, derived_c) = no
is_a(derived_b, derived_d) = no
is_a(derived_b, if_a) = yes
is_a(derived_b, if_b) = yes

is_a(derived_c, base) = yes
is_a(derived_c, derived_a) = yes
is_a(derived_c, derived_b) = no
is_a(derived_c, derived_c) = yes
is_a(derived_c, derived_d) = no
is_a(derived_c, if_a) = yes
is_a(derived_c, if_b) = yes

is_a(derived_d, base) = yes
is_a(derived_d, derived_a) = yes
is_a(derived_d, derived_b) = no
is_a(derived_d, derived_c) = yes
is_a(derived_d, derived_d) = yes
is_a(derived_d, if_a) = yes
is_a(derived_d, if_b) = yes
---- 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