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Peter Kokot
af29403ea0
This wasn't activated due to inconsistent availability over the editline/readline versions and variants. This now checks whether the rl_erase_empty_line variable is available in library headers and enables it based on that. On Windows this is for now still disabled due to wineditline library, which doesn't have this yet. Documentation already mentions the erase_empty_line setting: https://www.php.net/manual/en/function.readline-info.php
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).