How can the value of a specific variable from a MySQL database be retrieved and used for session authentication in PHP?

To retrieve the value of a specific variable from a MySQL database and use it for session authentication in PHP, you can first query the database to fetch the value using a SELECT statement. Once you have retrieved the value, you can store it in a session variable for authentication purposes. 

// Connect to MySQL database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Query to retrieve the value of a specific variable
$query = "SELECT variable_value FROM table_name WHERE condition = 'value'";
$result = mysqli_query($connection, $query);
$row = mysqli_fetch_assoc($result);

// Store the retrieved value in a session variable
$_SESSION['auth_variable'] = $row['variable_value'];

// Close the database connection
mysqli_close($connection);

Keywords

PHP MySQL session authentication variable retrieval database integration

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