SQLite: PDOException: open_basedir prohibits opening :memory:?cache=shared

Description

The following code:

#!/usr/bin/env php
<?php

print "open_basedir: ";
var_dump(ini_get("open_basedir"));
print "\n";

$db = new \PDO("sqlite::memory:?cache=shared", null, null, [
    \PDO::ATTR_PERSISTENT => true,
    \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
    \PDO::ATTR_EMULATE_PREPARES => false,
    \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC,
]);

Resulted in this output:

$ ./sqlite-nomemory.php
open_basedir: string(0) ""

PHP Fatal error:  Uncaught PDOException: open_basedir prohibits opening :memory:?cache=shared in …\sqlite-nomemory.php:8
Stack trace:
#0 …\sqlite-nomemory.php(8): PDO->__construct('sqlite::memo
ry:...', NULL, Object(SensitiveParameterValue), Array)
#1 {main}
  thrown in …\sqlite-nomemory.php on line 8

But I expected this output instead:

I expected no error. Frankly, the code should just work.

PHP Version

PHP 8.4.13 (cli) (built: Sep 23 2025 15:17:09) (ZTS Visual C++ 2022 x64)
Copyright (c) The PHP Group
Zend Engine v4.4.13, Copyright (c) Zend Technologies
    with Zend OPcache v8.4.13, Copyright (c), by Zend Technologies

Operating System

Windows 10

まず、Windows 10 上で PHP 8.4.13 を使って sqlite-nomemory.php の再現を実行し、PDO コンストラクターから到達する PDO SQLite の処理を調査します。示されている sqlite::memory:?cache=shared 接続が open_basedir 例外なしで成功すれば完了です。オープンな pull request はすでにリンクされています。