Req #72589 [Opn]: "OR" is used differently

From: Date: Wed, 13 Jul 2016 17:14:13 +0000
Subject: Req #72589 [Opn]: "OR" is used differently
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-202286@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=72589&edit=1

 ID:                 72589
 Updated by:         cmb@php.net
 Reported by:        xxalfa at gmail dot com
 Summary:            "OR" is used differently
 Status:             Open
 Type:               Feature/Change Request
 Package:            *General Issues
 Operating System:   macOS 10.11.5
 PHP Version:        7.0.8
 Block user comment: N
 Private report:     N

 New Comment:

> @cmb recognizes it well, you need a negation.

Then we might as well introduce unless, see
<http://docstore.mik.ua/orelly/perl4/prog/ch04_03.htm>.


Previous Comments:
------------------------------------------------------------------------
[2016-07-13 17:06:10] xxalfa at gmail dot com

@nikic I thank you for your detailed thoughts.

@cmb recognizes it well, you need a negation.

------------------------------------------------------------------------
[2016-07-13 11:05:15] cmb@php.net

Should have been

  if (!$test) exit;

------------------------------------------------------------------------
[2016-07-13 11:03:19] cmb@php.net

And all that so one could write

  $test or exit;

instead of

  if ($test) exit;

Doesn't make sense to me.

------------------------------------------------------------------------
[2016-07-13 10:41:13] nikic@php.net

@kalle: There's not really a technical problem here, just needs a change in grammar and dummy
return value.

This will need an RFC though. I'm personally not a fan of this, because I consider it bad
style.

Also consider what specifically you want to allow. Do you want to special-case the "or"
operator (bad idea imho) or do we end up allowing "1 + throw $x" (consistent, but meh)?

Also consider the precedence of these new "operators". What does "true or return 1 or
return 2" do? Is it "true or (return 1) or (return 2)" or is it "true or (return
(1 or (return 2)))?

Lastly, consider which statements you want to convert to expressions. All "jump"
operations, i.e. throw, return, break, continue, goto? Or more than that? Do you want to allow
"true or unset($var)"? Do you want to allow "true or foreach ($x as $y) { ...
}"? Etc.

------------------------------------------------------------------------
[2016-07-13 10:19:56] cmb@php.net

Related to request #31627.

------------------------------------------------------------------------


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    https://bugs.php.net/bug.php?id=72589


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