Hi, I'm Derick. And this is PHP internals news, a weekly podcast dedicated to demystifying the development of the PHP language. This is Episode 51. Today I'm talking with Larry Garfield, not about an RFC for once, but about a blog post that he's written called Object Ergonomics. Larry, would you please introduce yourself?

Hello World. My name is Larry Garfield, also Crell, CRELL, on various social medias. I work at platform.sh in developer relations. We're a continuous deployment cloud hosting company. I've been writing PHP for 21 years and been a active gadfly and nudge for at least 15 of those.

In the last couple of months, we have seen quite a lot of smaller RFCs about all kinds of little features here and there, to do with making the object oriented model of PHP a little bit better. I reckon this is also the nudge behind you writing a slightly longer blog post titled "Improving PHP object ergonomics".

If by slightly longer you mean 14 pages? Yes.

Yes, exactly. Yeah, it took me a while to read through. What made you write this document?

As you said, there's been a lot of discussion around improving PHP's general user experience of working with objects in PHP. Where there's definitely room for improvement, no question. And I found a lot of these to be useful in their own right, but also very narrow and narrow in ways that solve the immediate problem but could get in the way of solving larger problems later on down the line. So I went into this with an attitude of: Okay, we can kind of piecemeal and attack certain parts of the problem space. Or we can take a step back and look at the big picture and say: Alright, here's all the pain points we have. What can we do that would solve not just this one pain point. But let us solve multiple pain points with a single change? Or these two changes together solve this other pain point as well. Or, you know, how can we do this in a way that is not going to interfere with later development that we've talked about. We know we want to do, but isn't been done yet. So how do we not paint ourselves into a corner by thinking too narrow?

It's a curious thing, because a more narrow RFC is likely easier to get accepted, because it doesn't pull in a whole set of other problems as well. But of course, as you say, if the whole idea hasn't been thought through, then some of these things might not actually end up being beneficial. Because it can be combined with some other things to directly address the problems that we're trying to solve, right?

Yeah, it comes down to what are the smallest changes we can make that taken together have the largest impact. That kind of broad picture thinking is something that is hard to do in PHP, just given the way it's structured. So I took a stab at that.

What are the main problems that we should address?

Hi, I'm Derick. And this is PHP internals news, a weekly podcast dedicated to demystifying the development of the PHP language. This is Episode 52. Today I'm talking with George Banyard about an RFC that he's made together with Mate Kocsis. This RFC is titled locale independent floats to string. Hello, George, would you please introduce yourself?

Hello, I'm George Peter Banyard. I'm a student at Imperial College and I work on PHP in my free time.

All right, so we're talking about local independent floats. What is the problem here?

Currently when you do a float to string conversion, so all casting or displaying a float, the conversion will depend on like the current local. So instead of always using like the decimal dot separator. For example, if you have like a German or the French locale enabled, it will use like a comma to separate like the decimals.

Okay, I can understand that that could be a bit confusing. What are these locales exactly?

So locales, which are more or less C locales, which PHP exposes to user land is a way how to change a bunch of rules on how string and like stuff gets displayed on the C level. One of the issues with it is that like it's global. For example, if you use like a thread safe API, if you use the thread safe PHP version, then set_locale() is not thread safe, so we'll just like impact other threads where you're using it.

So a locale is a set of rules to format specific things with floating point numbers being one of them in which situations does the locale influence the display a floating point numbers in every situation in PHP or only in some?

Yes, it only impacts like certain aspects, which is quite surprising. So a string cast will affect it the strval() function, vardump(), and debug_zval_dump() will all affect the decimal locator and also printf() with the percentage lowercase F, but that's expected because it's locale aware compared to the capital F modifier.

But it doesn't, for example, have the same problem in the serialised function or say var_export().

Yeah, and json_encode() also doesn't do that. PDO has special code which handles also this so that like all the PDO drivers get like a constant treat like float string, because that could like impact on the databases.

How is it a problem that with some locales enabled and then uses a comma instead of the decimal point. How can this cause bugs and PHP applications?