Why Does My PHP MySQL Connection Fail with 'No Such File or Directory'?

Troubleshooting MySQL Connection Error: "No Such File or Directory"

When attempting to connect to a MySQL database through PHP, you may encounter an error stating, "Warning: mysqli_connect(): (HY000/2002): No such file or directory." This error indicates that the system cannot locate the MySQL host specified in the connection string.

The Issue

In the provided code snippet, the host parameter of the mysqli_connect function is set to "localhost." However, it appears that the actual host address for your MySQL server is 127.0.0.1.

localhost vs. 127.0.0.1

While it is often assumed that "localhost" and "127.0.0.1" refer to the same location, they are technically distinct. "localhost" denotes the local machine from the perspective of the application, while "127.0.0.1" represents the IPv4 loopback address. In certain configurations, MySQL may not be listening on the "localhost" address, hence the connection failure.

Resolution

To resolve this issue, simply replace "localhost" with "127.0.0.1" in the host parameter of your connection string:

$host = "127.0.0.1";

If the host address is still incorrect, check your MySQL configuration files or consult the MySQL documentation for the correct host setting.

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