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To: Christoph Becker <cmbecker69@gmx.de>, 
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Subject: Re: [PHP-DEV] [RFC] Introduce Abstract Syntax Tree
From: mike@php.net (Michael Wallner)

On 14/08/14 13:30, Christoph Becker wrote:
> Michael Wallner wrote:
> 
>> On 14 08 2014, at 11:33, Alain Williams <addw@phcomp.co.uk> wrote:
>>> Some code is just broken.
>>
>> Wat? No. This is totally different to two in/decrements on one line. This has to be executed in order.

Ignore that.

> 
> The current specification draft says[1]:
> 
> | Unless stated explicitly in this specification, the order in which
> | the operands in an expression are evaluated relative to each other is
> | unspecified.
> | [...]
> | Finally, in the full expression f() + g() * h(), the order in which
> | the three functions are called, is unspecified).
> 
> [1]
> <https://github.com/php/php-langspec/blob/master/spec/10-expressions.md#expressions>
> 

You're right, it's documented, too; in the operator section not in the
expression section, though:

---8<---
PHP does not (in the general case) specify in which order an expression
is evaluated and code that assumes a specific order of evaluation should
be avoided, because the behavior can change between versions of PHP or
depending on the surrounding code.
--->8---

http://php.net/manual/en/language.operators.precedence.php

-- 
Regards,
Mike