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Bug #78017 Null coalesce operator in if paranthesis causes unexpected behaviour
Submitted: 2019-05-15 13:26 UTC Modified: 2019-05-15 13:37 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: dorndorf at featdd dot de Assigned:
Status: Not a bug Package: PHP Language Specification
PHP Version: 7.2.18 OS: macOS 10.14.4
Private report: No CVE-ID: None
View Developer Edit
 [2019-05-15 13:26 UTC] dorndorf at featdd dot de 
Description:
------------
Using the null coalesce operator inside an if paranthesis using and resulting in false will match the condition anyway when the returned value is true.

Test script:
---------------
if (true ?? false && 0 > 0) {
    echo 'Should not be true';
}

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 [2019-05-15 13:37 UTC] nikic@php.net
-Status: Open +Status: Not a bug
 [2019-05-15 13:37 UTC] nikic@php.net 
?? has lower precedence than &&, so this is true ?? (false && 0 > 0). See https://www.php.net/manual/en/language.operators.precedence.php for operator precedence in PHP.
 [2019-05-15 14:58 UTC] dorndorf at featdd dot de 
oh my shame, I had a more complex example in my project where this case can easily be misunderstood.

Thanks for the quick response, learned something interesting new today :-)
 
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