Values stored in Memcached influence variables defined in PHP

[wellnessliving]

Hello!

I have two files:

set('key','arbitrary_variable_name',0); include_once('b.php'); b(); ?>

When I try to run it under CLI, I get error:

[root@s6 q]# php a.php
PHP Notice: Undefined variable: arbitrary_variable_name in /home/wl/.htprivate/options/q/b.php on line 7
array(1) {
[0]=>
NULL
}

Error does not occur if I change name of the variable, or value stored in Memcached.

PHP 7.0.3 (cli) (built: Feb 4 2016 08:51:10) ( NTS )
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
libmemcached-1.0.18
Memcached extension sources are downloaded from php7 branch.

[yuripave]

I have similar issue with latest commit in php7 branch 52c644b via dotdeb https://github.com/gplessis/dotdeb-php-memcached/releases/tag/upstream%2F2.2.0-2-52c644b

I cannot reproduce with a test script yet but the issue is causing unexpected userland variable behavior:

$memcache = new \Memcached();
$memcache->addServer('localhost', 11211);
$json_from_memcached = $memcache->get('json'); // a valid json saved earlier
json_decode($json_from_memcached, true); // null, expected to be array
$json_from_literal = '{"valid":"json"}'; // same content as $json_from_memcached
json_decode($json_from_literal , true); // array
md5($json_from_memcached) == md5($json_from_literal); // true

I can confirmed last dotdeb release has no such issue.
https://github.com/gplessis/dotdeb-php-memcached/releases/tag/upstream%2F2.2.0-1-7cb0c48
which is on 7cb0c48.

[krakjoe]

I am not able to reproduce this issue with the latest 7.0, or 7.1.

Can anyone else?

[yuripave]

Sadly I am unable to reproduce in non-production environment and do not have time to test latest php7 branch. Our production is running fine with 7cb0c48, thanks!
@yuri-popoff Do you have time to make a reproducible test script?

[dictcp]

for @yuripave case, it should be the same as #250

[thias]

Both #250 and #252 are closed, so this issue could probably be closed too now.

[cosminardeleanu]

I have the same issue:

class Test
{
    public function __construct()
    {
        $memcached = new \Memcached();
        $memcached->set('key', 'whatever');
    }

    public function wtf()
    {
        $whatever = 'tests';

        function () use ($whatever) {
            return $whatever;
        };
    }
}
(new Test())->wtf();

When executing this file from cli, i get

PHP Notice: Undefined variable: whatever in /home/vagrant/www/a.php on line 14
Php version : PHP 7.0.6-1+donate.sury.org~trusty+1 (cli) ( NTS )

[pyrou]

Another test case :

<?php

(new Memcached)->set("key", "a");

$test = create_function('', '$a = 10; return $a;');

var_dump($test()); // NULL
// PHP Notice:  Undefined variable: a in [...]/test.php(6) : runtime-created function on line 1

$test = create_function('', '$b = 10; return $b;');

var_dump($test()); // int(10)

$b is defined as expected

PHP 7.0.24 (cli) (built: Oct 5 2017 23:28:51) ( NTS )
PHP 7.0.27 (cli) (built: Jan 5 2018 12:24:33) ( NTS )

libmemcached version => 1.0.18