Are there specific security considerations to keep in mind when using PHP to access external databases in WordPress?

When using PHP to access external databases in WordPress, it is crucial to sanitize and validate user input to prevent SQL injection attacks. Additionally, always use prepared statements or parameterized queries to securely interact with the database. Avoid storing sensitive information such as database credentials directly in the PHP code. 

// Establish a secure connection to the external database
$servername = "external_db_host";
$username = "external_db_user";
$password = "external_db_password";
$dbname = "external_db_name";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

Keywords

PHP security external databases WordPress access

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