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Bug #79109 foreach on empty array
Submitted: 2020-01-13 13:25 UTC Modified: 2020-01-13 13:28 UTC
From: a dot dankovtsev at mail dot ru Assigned:
Status: Duplicate Package: opcache
PHP Version: 7.4.1 OS: debian stretch
Private report: No CVE-ID: None
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From: a dot dankovtsev at mail dot ru
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 [2020-01-13 13:25 UTC] a dot dankovtsev at mail dot ru
Description:
------------
In test env in our product sometimes caused Undefined variable $value with empty array
But local don't reproduce


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

class Test
{
    private const PRIVATE_ARRAY = [];

    public function run(): int
    {
        foreach (self::PRIVATE_ARRAY as $key => $value) {
            return $value;
        }

        return 1;
    }
}

(new Test())->run();



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 [2020-01-13 13:28 UTC] nikic@php.net
-Status: Open +Status: Duplicate
 [2020-01-13 13:28 UTC] nikic@php.net
I don't think we have a bug reference for it, but this issue is already fixed in 7.4.2.

It is related to opcache, which is likely why you can't reproduce locally.
 
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