How to connect to remote MySQL database in PHP under Linux?

Connecting to remote MySQL database using PHP in Linux environment

This article will answer the question of how to connect to remote MySQL database through PDO extension under Linux system. The questioner found that there are few configuration items about PDO in the php.ini file, especially when connecting to a remote MySQL database (using IP:port method), the corresponding IP address configuration item cannot be found, and he expressed doubts about the lack of sock configuration items for PDO extensions and different databases in php.ini.

The screenshot provided by the questioner shows some configurations about PDO in php.ini, mainly some settings about socket paths. However, connecting to a remote MySQL database using PDO does not require any special configuration in php.ini.

The configuration to connect to the remote MySQL database is not done in php.ini. The specific parameters of the PDO connection, such as the database host address, port number, user name, password, etc., are specified through the constructor parameters when instantiating the PDO object. The PDO extension configuration items in the php.ini file, such as pdo_mysql.dll (Windows) or pdo_mysql.so (Linux), only enable PDO support for MySQL databases and do not include settings for connection parameters. Extensions of other database types, such as pdo_sqlite, pdo_firebird, and pdo_pgsql, also follow the same principles. Their existence in php.ini is merely to indicate that PHP has installed support for these databases, and the specific parameters for connecting these databases are still specified in the PHP code through the constructor of the PDO object. Therefore, there is no need to look for socket configuration items related to database connections in php.ini, as these configurations are all done in PHP code.

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