Add a test for the LOG function.
Add a test for parse_arguments.
Fix flag libraries.
Add functions: isset and ord.
Add a function: bin2hex.
Change the namespace of functions to php.
Change the behavior of parse_arguments.
Update flag libraries.
Prepare for supporting flags.
Support command-line flags.
Add a sort function.
Change the precision of datetime for LOG.
Add a test for php::strtoupper.
Add a test for php::strtolower.
Show details of variables when imosh::internal::parse_args fails.
Add a test for an uninitialized variable.
Show bash's version before testing.
Change for consistency for uninitialized variables.
Change the behavior when a test fails.
Fix behavior differences between bash 3 and 4.