The addon should be installed on the live site. This ensures any time the site's database is exported, pushed or pulled, the user data is anonymized.

When the plugin is activated it will anonymize by default. You will need to deactivate the plugin to turn it off.

To preserve specific rows in the users table, use the WPMDB_ANONYMIZATION_USER_LOGIN_WHITELIST constant to set a whitelist of comma separated user logins.

To replace all passwords with a hashed default password, set the password using the WPMDB_ANONYMIZATION_DEFAULT_PASSWORD constant.

The rules for anonymization can be extended using the wpmdb_anonymization_config filter:

/**
 * Anonymizes a users date of birth.
 *
 * @param array $config
 *
 * @return array
 */
function my_wpmdb_anonymization_rules( $config ) {
    $config['usermeta']['meta_value'][] = array(
        'constraint'     => array( 'meta_key' => 'dob' ),
        'fake_data_type' => 'dateTimeThisCentury',
    );

    return $config;
}