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Thread-Topic: [RFC] Configurable callback to dump results of expressions in
 `php -a`
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Date: Wed, 6 Jan 2021 03:42:33 +0000
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Subject: Re: [RFC] Configurable callback to dump results of expressions in
 `php -a`
From: tysonandre775@hotmail.com (tyson andre)

Hi internals,=0A=
=0A=
> I've created a new RFC https://wiki.php.net/rfc/readline_interactive_shel=
l_result_function=0A=
> adding a way to configure a callback to be called to dump the value of si=
ngle-expression statements from `php -a`=0A=
> (and an ini setting that can be disabled to prevent that callback from be=
ing called).=0A=
> =0A=
> Many REPLs (Read-Eval-Print Loops) for other programming languages that I=
'm familiar with=0A=
> print a (possibly truncated) representation of the result of expressions,=
 but PHP doesn't.=0A=
> It would be useful to allow users to extend the functionality of the defa=
ult interactive php shell (php -a),=0A=
> possibly with auto_prepend_file or through use of command wrappers/aliase=
s, or after loading the shell.=0A=
> Prior to this RFC, there was no way to extend the interactive php shell i=
n this way.=0A=
> (I've seen https://github.com/bobthecow/psysh mentioned as an alternative=
 for php -a while investigating this,=0A=
> but that's a shell written from scratch, and doesn't have some functional=
ity from php -a such as tolerance of fatal errors)=0A=
> =0A=
> Because PHP's interactive shell is written in C, adding new features or b=
ug fixes is inconvenient - it would require a lot=0A=
> of time getting familiar with C programming, PHP's internals and memory m=
anagement,=0A=
> and with PHP's internal C ast representation.=0A=
> It would be easier and more accessible to extend PHP's interactive shell =
through code written in PHP rather than code written in C.=0A=
> =0A=
> This was among the proposed enhancements I brought up in https://external=
s.io/message/111073 .=0A=
> An earlier version of the implementation was also created months ago -=A0=
 https://github.com/php/php-src/pull/5962=0A=
=0A=
Some of the feedback had mentioned that adding the ability to dump the resu=
lts of expressions in the default shell=0A=
only made sense if there was a default implementation included with this RF=
C.=0A=
=0A=
I plan to start a straw poll shortly, to measure interest with/without a pr=
oposed result expression dumper loaded by default.=0A=
https://wiki.php.net/rfc/readline_interactive_shell_result_function_straw_p=
oll=0A=
=0A=
Thanks,=0A=
- Tyson=