If you wrap multiple scripts invoked by an intepreter, the wrapper script will behave stupid.
For example:

lockfile_wrapper.sh /usr/bin/php some_script1.php
lockfile_wrapper.sh /usr/bin/php some_script2.php

will use the same lockfile for both scripts because it just uses the basename of the command, which is "/usr/bin/php" to identify the wrapped command.

To fix this issue, i intend to hash all command line arguments and write that hash into the filename.
To workaround this issue, you can change the lockfile as parameter

lockfile_wrapper.sh /usr/bin/php some_script1.php
lockfile_wrapper.sh /usr/bin/php some_script2.php -l /tmp/wrapper_some_script2.lock -o /tmp/wrapper_some_script2.out

If for some reason the lockfile gets deleted, but the process is still running, one could just recreate the lockfile instead of launching another instance of the program.