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HAVE_ERASE_EMPTY_LINE always gets the last AC_DEFINE help text, so it is simpler to have the same help message for both definitions (readline and editline). First text never got into header via autoheader anyway.
readline
Provides generic line editing, history, and tokenization functions. See https://www.php.net/manual/en/book.readline.php
Implementation Details
C variables starting with rl_* are declared by the readline library
(or are macros referring to variables from the libedit library).
See http://web.mit.edu/gnu/doc/html/rlman_2.html
This should only be used in the CLI SAPI. Historically, the code lived in sapi/cli, but many distributions build readline as a shared extension. Therefore, that code was split into ext/readline so that this can dynamically be loaded. With other SAPIs, readline is/should be disabled.
readline_cli.c implements most of the interactive shell(php -a).