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Bug #69160 Yield with operator regression
Submitted: 2015-03-02 15:23 UTC Modified: 2015-03-09 11:43 UTC
From: pierre at pcservice dot co dot za Assigned: nikic (profile)
Status: Closed Package: Unknown/Other Function
PHP Version: master-Git-2015-03-02 (Git) OS: ALL
Private report: No CVE-ID: None
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 [2015-03-02 15:23 UTC] pierre at pcservice dot co dot za 
Description:
------------
When yielding using + or - operator, the value is returned before the operation is performed. In previous versions of PHP (>= 5.5 && < 7.0-dev) the operation was first performed on the value before it was return.

Test script:
---------------
function a () {
    echo yield + 3;
}

$a = a();
$a->send(42);

Expected result:
----------------
45

Actual result:
--------------
42

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 [2015-03-04 06:25 UTC] laruence@php.net
-Assigned To: +Assigned To: nikic
 [2015-03-07 19:38 UTC] bwoebi@php.net 
This isn't a bug: It's now handled as unary operator due to yield operator having right associativity with high precedence and not requiring parenthesis anymore.

It is basically a BC break caused by AST RFC and should be noted as such in UPGRADING under Backward Incompatible Changes.

For this particular case you now either have to put the operand before the yield:
echo 3 + yield;

Or put parenthesis around it:
echo (yield) + 3;
 [2015-03-09 11:43 UTC] nikic@php.net
-Status: Assigned +Status: Closed
 [2015-03-09 11:43 UTC] nikic@php.net 
UPGRADING note added in https://github.com/php/php-src/commit/2f156c61f19a889c8ed39fe8eb3b3220555db647.
 
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