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Bug #78187 Exponentiation operator gives incorrect result
Submitted: 2019-06-20 08:40 UTC Modified: 2019-06-20 08:45 UTC
From: francis dot crossen at gmail dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 7.3.6 OS: n/a
Private report: No CVE-ID: None
View Developer Edit
 [2019-06-20 08:40 UTC] francis dot crossen at gmail dot com 
Description:
------------
Tested in PHP shell on Linux and Windows

Test script:
---------------
<?php

// expect 1
echo -1 * -1 . PHP_EOL;
echo pow(-1, 2) . PHP_EOL;
echo -1 ** 2 . PHP_EOL;

// expect 49
echo -7 * -7 . PHP_EOL;
echo pow(-7, 2) . PHP_EOL;
echo -7 ** 2 . PHP_EOL;

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 [2019-06-20 08:45 UTC] nikic@php.net
-Status: Open +Status: Not a bug
 [2019-06-20 08:45 UTC] nikic@php.net 
-1 ** 2 is -(1**2).

I would recommend to avoid spaces around ** to indicate that this is a high-precedence operator.
 
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