Re: [RFC] Scalar Type Hinting With Casts (re-opening)

From: Date: Wed, 16 Jul 2014 23:35:23 +0000
Subject: Re: [RFC] Scalar Type Hinting With Casts (re-opening)
References: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20  Groups: php.internals 
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On 17 Jul 2014, at 00:18, Rowan Collins <rowan.collins@gmail.com> wrote:

> Now, I have no idea how ZPP actually works, and get lost in a maze of macros whenever I try to
> look at it, but evidently it has logic to distinguish, at least for string->int, three cases:
> 
> 1) safe / lossless / well formed input (cast silently), e.g. '123' => int(123)
> 2) unsafe / lossy / non well formed (give a notice), 'e.g. '123abc' =>
> int(123)
> 3) impossible / inappropriate (from the point of view of the user, give a warning, and cause
> different behaviour of the function), e.g. 'abc' => int

zpp’s casts are (one form of) implicit cast. We actually do multiple different kinds of implicit
casts in different places with different results; “0xa” is variously an integer and not an
integer, depending on context, because nobody seems to have made their mind up whether
is_numeric_string or strtol is used to parse numeric strings. :(

The only casts that are explicit are using (int) and friends, or intval() and friends (I believe the
two are equivalent).

--
Andrea Faulds
http://ajf.me/

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