Why Is My PHP Code Failing to Connect to MySQL?

Establishing MySQL Database Connection in PHP Using Mysqli Extension

When attempting to connect to a MySQL database in a PHP web server environment, developers may encounter the error "Failed to connect to MySQL." To resolve this issue, it's essential to ensure that the connection parameters are correctly configured.

In the provided code snippet, the line mysqli_connect("", "username", "password", "databasename"); incorrectly sets the server name as an empty string. In most cases, the server name should be either "localhost" (for local connections) or the IP address or hostname of the remote MySQL server.

Using localhost as Server Name

For local connections, where the MySQL server resides on the same machine as the PHP script, use "localhost" as the server name. The corrected code is:

<?php $con = mysqli_connect("localhost","username" ,"password","databasename");

    if (mysqli_connect_errno())
    {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }
?>

Using Mysqli Procedural

An alternative method is to use the mysqli procedural approach:

<?php $servername = "localhost";
    $username = "username";
    $password = "password";

    // Create connection
    $con = mysqli_connect($servername, $username, $password);

    // Check connection
    if (!$con) {
        die("Connection failed: " . mysqli_connect_error());
    }
    echo "Connected successfully";
?>

Ensure that the username and password correspond to an authorized MySQL user.

Case-Specific Modifications

In some instances, additional modifications may be necessary. For example, if the MySQL server requires SSL encryption, the connection code must include the mysqli_ssl_set function. Consult the documentation for specific database requirements.

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