a['NAME'] = sprintf( '%s %s', $data['FNAME'], $data['LNAME'] );
	}

	return $data;
}

/**
 * Gets the "email type" for new subscribers.
 *
 * Possible return values are either "html" or "text"
 *
 * @access public
 * @since 3.0
 *
 * @return string
 */
function mc4wp_get_email_type() {
	$email_type = 'html';

	/**
	 * Filters the email type preference for this new subscriber.
	 *
	 * @param string $email_type
	 */
	$email_type = (string) apply_filters( 'mc4wp_email_type', $email_type );

	return $email_type;
}

/**
 *
 * @ignore
 * @return bool
 */
function _mc4wp_use_sslverify() {

	// Disable for all transports other than CURL
	if ( ! function_exists( 'curl_version' ) ) {
		return false;
	}

	$curl = curl_version();

	// Disable if OpenSSL is not installed
	if ( empty( $curl['ssl_version'] ) ) {
		return false;
	}

	// Disable if on WP 4.4, see https://core.trac.wordpress.org/ticket/34935
	if ( $GLOBALS['wp_version'] === '4.4' ) {
		return false;
	}

	return true;
}

/**
 * This will replace the first half of a string with "*" characters.
 *
 * @param string $string
 * @return string
 */
function mc4wp_obfuscate_string( $string ) {
	$length            = strlen( $string );
	$obfuscated_length = ceil( $length / 2 );
	$string            = str_repeat( '*', $obfuscated_length ) . substr( $string, $obfuscated_length );
	return $string;
}

/**
 * @internal
 * @ignore
 */
function _mc4wp_obfuscate_email_addresses_callback( $m ) {
	$one   = $m[1] . str_repeat( '*', strlen( $m[2] ) );
	$two   = $m[3] . str_repeat( '*', strlen( $m[4] ) );
	$three = $m[5];
	return sprintf( '%s@%s.%s', $one, $two, $three );
}

/**
 * Obfuscates email addresses in a string.
 *
 * @param $string String possibly containing email address
 * @return string
 */
function mc4wp_obfuscate_email_addresses( $string ) {
	return preg_replace_callback( '/([\w\.]{1,4})([\w\.]*)\@(\w{1,2})(\w*)\.(\w+)/', '_mc4wp_obfuscate_email_addresses_callback', $string );
}

/**
 * Refreshes Mailchimp lists. This can take a while if the connected Mailchimp account has many lists.
 *
 * @return void
 */
function mc4wp_refresh_mailchimp_lists() {
	$mailchimp = new MC4WP_MailChimp();
	$mailchimp->refresh_lists();
}

/**
* Get element from array, allows for dot notation eg: "foo.bar"
*
* @param array $array
* @param string $key
* @param mixed $default
* @return mixed
*/
function mc4wp_array_get( $array, $key, $default = null ) {
	if ( is_null( $key ) ) {
		return $array;
	}

	if ( isset( $array[ $key ] ) ) {
		return $array[ $key ];
	}

	foreach ( explode( '.', $key ) as $segment ) {
		if ( ! is_array( $array ) || ! array_key_exists( $segment, $array ) ) {
			return $default;
		}

		$array = $array[ $segment ];
	}

	return $array;
}

/**
 * Filters string and strips out all HTML tags and attributes, except what's in our whitelist.
 *
 * @param string $string The string to apply KSES whitelist on
 * @return string
 * @since 4.8.8
 */
function mc4wp_kses( $string ) {
	$always_allowed_attr = array_fill_keys(
		array(
			'aria-describedby',
			'aria-details',
			'aria-label',
			'aria-labelledby',
			'aria-hidden',
			'class',
			'id',
			'style',
			'title',
			'role',
			'data-*',
			'tabindex',
		),
		true
	);
	$input_allowed_attr  = array_merge(
		$always_allowed_attr,
		array_fill_keys(
			array(
				'type',
				'required',
				'placeholder',
				'value',
				'name',
				'step',
				'min',
				'max',
				'checked',
				'width',
				'autocomplete',
				'autofocus',
				'minlength',
				'maxlength',
				'size',
				'pattern',
				'disabled',
				'readonly',
			),
			true
		)
	);

	$allowed = array(
		'p'        => $always_allowed_attr,
		'label'    => array_merge( $always_allowed_attr, array( 'for' => true ) ),
		'input'    => $input_allowed_attr,
		'button'   => $input_allowed_attr,
		'fieldset' => $always_allowed_attr,
		'legend'   => $always_allowed_attr,
		'ul'       => $always_allowed_attr,
		'ol'       => $always_allowed_attr,
		'li'       => $always_allowed_attr,
		'select'   => array_merge( $input_allowed_attr, array( 'multiple' => true ) ),
		'option'   => array_merge( $input_allowed_attr, array( 'selected' => true ) ),
		'optgroup' => array(
			'disabled' => true,
			'label' => true,
		),
		'textarea' => array_merge(
			$input_allowed_attr,
			array(
				'rows' => true,
				'cols' => true,
			)
		),
		'div'      => $always_allowed_attr,
		'strong'   => $always_allowed_attr,
		'b'         => $always_allowed_attr,
		'i'         => $always_allowed_attr,
		'br'        => array(),
		'em'       => $always_allowed_attr,
		'span'     => $always_allowed_attr,
		'a'        => array_merge( $always_allowed_attr, array( 'href' => true ) ),
		'img'      => array_merge(
			$always_allowed_attr,
			array(
				'src' => true,
				'alt' => true,
				'width' => true,
				'height' => true,
				'srcset' => true,
				'sizes' => true,
				'referrerpolicy' => true,
			)
		),
		'u' => $always_allowed_attr,
	);

	return wp_kses( $string, $allowed );
}

/**
 * Helper function for safely deprecating a changed filter hook.
 *
 * @param string $old_hook
 * @param string $new_hook
 *
 * @return void
 */
function mc4wp_apply_deprecated_filters( $old_hook, $new_hook ) {
	add_filter( $new_hook, function ( $value, $a = null, $b = null, $c = null ) use ( $new_hook, $old_hook ) {
		return apply_filters_deprecated( $old_hook, array( $value, $a, $b, $c ), '4.9.0', $new_hook );
	}, 10, 3 );
}