Bug #78347 [Opn->Ver]: wrong socket path when host field is empty

Edit report at https://bugs.php.net/bug.php?id=78347&edit=1 ID: 78347 Updated by: sjon@php.net Reported by: l dot fuerderer at gmail dot com Summary: wrong socket path when host field is empty -Status: Open +Status: Verified Type: Bug Package: PDO MySQL Operating System: Arch Linux PHP Version: 7.3.7 Block user comment: N Private report: N New Comment: I can confirm this; to reproduce: $ strace -econnect php -n -dextension=pdo_mysql -dpdo_mysql.default_socket=/run/mysqld/mysqld.sock -r 'new \PDO("mysql:host=", "http", "");' >/dev/null connect(3, {sa_family=AF_UNIX, sun_path="/tmp/mysql.sock"}, 17) = -1 ENOENT (No such file or directory) +++ exited with 255 +++ while leaving off "host=" or changing it to "host=localhost" actually works It seems like this might be the cause: https://github.com/php/php-src/blob/eea206a06c6fcbcbabc590d287dc529588520095/ext/mysqlnd/mysqlnd_connection.c#L551 Previous Comments: ------------------------------------------------------------------------ [2019-07-29 12:03:55] l dot fuerderer at gmail dot com Description: ------------ In my Arch Linux I activated PDO MySql in the php.ini to connect to Mariadb: extension=pdo_mysql And I changed the socket path: pdo_mysql.default_socket=/run/mysqld/mysqld.sock When I connect to the database giving an empty hostname, PHP tries to connect to /tmp/mysql.sock ignoring the php.ini setting. (I saw this using strace) Test script: --------------- <?php // the following two lines work new \PDO("mysql:", "http", ""); new \PDO("mysql:host=localhost", "http", ""); // this line fails new \PDO("mysql:host=", "http", ""); Expected result: ---------------- Three successful connections, no output. Actual result: -------------- PHP Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2002] No such file or directory in /srv/http/databases.php:7 Stack trace: #0 /srv/http/databases.php(7): PDO->__construct('mysql:host=', 'http', '') #1 {main} thrown in /srv/http/databases.php on line 7 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=78347&edit=1