Why Does My PDO Connection Fail With \'No such file or directory (trying to connect via unix:///tmp/mysql.sock)\' When Using \'localhost\'?

PDO Connection Error: "No such file or directory (trying to connect via unix:///tmp/mysql.sock)"

In this question, the user expresses concern regarding an issue connecting to a database via PDO, which was functioning previously. The user is perplexed because they have not altered any settings related to the code or database and are unsure of the root of the problem.

The user's provided PHP code snippet suggests they are attempting to establish a TCP/IP connection to a database using a hostname of "localhost." However, the error message indicates an attempt to connect via a Unix socket instead.

Solution:

The user is unwittingly attempting to use a Unix socket due to the PHP client library's default handling of "localhost." This library interprets "localhost" as a socket location rather than a TCP host.

To resolve this error and establish a TCP/IP connection to the local machine, the user should substitute "127.0.0.1" as the hostname in their PHP code:

<code class="php">new PDO('mysql:host=127.0.0.1;port=3306;dbname=test', 'username', 'password');</code>

If the intention is to use a Unix socket, the user can explicitly specify its location in the DSN using the "unix_socket" DSN option instead of "host." The location of the Unix socket used for localhost can be configured at compile time or, in certain PHP versions, by modifying the "pdo_mysql.default_socket" setting in the php.ini file.

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