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Date: Tue, 4 Feb 2014 22:04:14 +0100
Message-ID: <CAH-PCH4+ULN2bVh=A2ZNvXmpYDqBPA3JrhhdrKb5zVH_sXucxg@mail.gmail.com>
To: Rowan Collins <rowan.collins@gmail.com>
Cc: PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Declare minimum PHP version required?
From: tyra3l@gmail.com (Ferenc Kovacs)

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On Tue, Feb 4, 2014 at 9:24 PM, Rowan Collins <rowan.collins@gmail.com>wrot=
e:

> On 04/02/2014 09:08, Yasuo Ohgaki wrote:
>
>> Similar thing could be achieved with new assert() w/o any overheads.
>>
>> https://wiki.php.net/rfc/expectations
>>
>> assert('version_compare(PHP_VERSION, "5.5.0", ">=3D")', 'You need PHP 5.=
5.0
>> or later');
>>
>
> I'm confused, isn't this exactly how assert() already works? What needs t=
o
> change, for this example in particular?
>
> Here it is running on several versions, giving a Warning by default:
> http://3v4l.org/TrBJm
> And here it is without the second parameter, which in itself requires PHP
> 5.3: http://3v4l.org/mcQI6
>
> It's slightly confusing that assertions issue a Warning even with
> ASSERT_BAIL turned on, but with that turned on (which can be at the ini
> level) you can see that it aborts the script as desired:
> http://3v4l.org/QZLog
>
> Regards,
>
> --
> Rowan Collins
> [IMSoP]
>
>
>
> --
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
with the current assert implementation the assert is a function, which
eval()-s the expression argument, but it will return early if asserts are
disabled(http://lxr.php.net/xref/PHP_5_5/ext/standard/assert.c#149)
with the proposed assert (https://wiki.php.net/rfc/expectations) the assert
will be changed into a language construct, which has the advantage that we
can use expressions instead of passing a string for evaluation without
additional cost, also executing that is cheaper than a function call, and
when the assertions are disabled they will be almost zero-cost.

--=20
Ferenc Kov=C3=A1cs
@Tyr43l - http://tyrael.hu

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