How do I fix the \'No such file or directory\' error when connecting to MySQL via PDO in PHP?

MySQL PDO Connection Issuing "No Such File or Directory" Warning

You encounter a "No such file or directory" error when attempting to connect to a MySQL database via a PHP PDO connection, despite specifying TCP/IP connection parameters.

Solution:

The error indicates that you are unknowingly using a Unix socket for the connection. When specifying "localhost" as the hostname in a PDO connection, MySQL client libraries default to interpreting it as a Unix socket location instead of a TCP/IP hostname.

To use TCP/IP, you must explicitly specify the hostname as "127.0.0.1" (or another IP address for the database server).

Additionally, if you desire to use a Unix socket, specify the "unix_socket" option in the PDO connection string's DSN (Data Source Name) instead of the "host" option. The default Unix socket location used for "localhost" connections can be defined during compilation or configured via the "pdo_mysql.default_socket" directive in the php.ini configuration file.

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