> Is this true? It's not true. Sorry about that. Script didn't crash.
But something worse happened. I took sources from https://github.com/ericnorris/php-src/archive/refs/heads/feat-mysqlnd-com-reset-connection.zip Configured them with `--enable-mysqlnd --enable-fpm --with-fpm-user=www-data --with-fpm-group=www-data --enable-pdo --with-pdo-mysql=mysqlnd` Up mysql 5.5.61. Started php-fpm with `pm = static` and `pm.max_children = 1`. Ran this script: ```php <?php $pdo = new PDO('mysql:host=172.17.0.1', 'root', '', [PDO::ATTR_PERSISTENT => true]); $q = $pdo->query('SHOW PROCESSLIST'); $rows = 0; while ($f = $q->fetch(PDO::FETCH_ASSOC)) { $rows++; } echo $rows . PHP_EOL; ``` On the first execution script echoes 1. On the second - 2. Each execution increments the counter by one. When I restart the php-fpm process, the counter restarts again from 1. There is connection leak here! When I removed `PDO::ATTR_PERSISTENT`, the counter stop increasing. When I switched to mysql 8, counter was always 1 (both with and without persistent connections).
