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Bug #79970 Null coalescing operator needs to have a higher precedence value
Submitted: 2020-08-13 12:43 UTC Modified: 2020-08-13 13:35 UTC
From: folarin at engineer dot com Assigned:
Status: Not a bug Package: *Programming Data Structures
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
View Developer Edit
 [2020-08-13 12:43 UTC] folarin at engineer dot com 
Description:
------------
Look at the following example

$var1 = true
$var2 = true

if($var1??false && $var2)
echo 'Passed"
else
echo 'Failed'

The above expresion always prints 'Failed' which isn't the expected behaviour.
Just like the Parenthesis, the null-coalescing operator should ALWAYS be expressed first.

This now causes the unwanted, over-expressive use of parenthesis to remedy the cause ALL THE TIME:

if(($var1??false) && ($var2??false))...

why do I have to do the above when none of

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 [2020-08-13 12:46 UTC] cmb@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

> why do I have to do the above when none of 

if (!empty($var1) && !empty($var2))
 [2020-08-13 12:47 UTC] cmb@php.net
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: cmb
 [2020-08-13 12:47 UTC] cmb@php.net 
.
 [2020-08-13 12:48 UTC] nikic@php.net
-Assigned To: cmb +Assigned To:
 [2020-08-13 12:48 UTC] nikic@php.net 
Precedence is a trade-off. Use explicit parentheses in cases where it is not clear to you.

The current choice of precedence is for consistency with the ?: operator, and consistency across languages (e.g. matches C# operator precedence).
 [2020-08-13 13:35 UTC] folarin at engineer dot com 
Fair enough
 
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