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"Pdo\Mysql object is uninitialized" when opening a persistent connection #16314

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@derrabus

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@derrabus

Description

The following code:

<?php

declare(strict_types=1);

$pdo = PDO::connect('mysql:host=127.0.0.1;dbname=test', 'root', '', [PDO::ATTR_PERSISTENT => true]);
$pdo->query('SELECT 1;');

Resulted in this output:

Fatal error: Uncaught Error: Pdo\Mysql object is uninitialized in /path/to/test.php on line 6

Error: Pdo\Mysql object is uninitialized in /path/to/test.php on line 6

Call Stack:
    0.0001     395016   1. {main}() /path/to/test.php:0
    0.0020     395152   2. PDO->query($query = 'SELECT 1;', $fetchMode = ???) /path/to/test.php:7

[1]    65142 bus error  php test.php

But I expected this output instead: No error.

The error is gone if I either set PDO::ATTR_PERSISTENT to false or call the oldschool constructor (new PDO(…)).

PHP Version

PHP 8.4-dev

Operating System

MacOS 15.0.1

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