register_setting( string $option_group, string $option_name, array $args = array() )

Register a setting and its data.

Parameters

$option_group

(string) (Required) A settings group name. Should correspond to a whitelisted option key name. Default whitelisted option key names include "general," "discussion," and "reading," among others.

$option_name

(string) (Required) The name of an option to sanitize and save.

$args

(array) (Optional) Data used to describe the setting when registered.

  • 'type'
    (string) The type of data associated with this setting. Valid values are 'string', 'boolean', 'integer', and 'number'.
  • 'description'
    (string) A description of the data attached to this setting.
  • 'sanitize_callback'
    (callable) A callback function that sanitizes the option's value.
  • 'show_in_rest'
    (bool) Whether data associated with this setting should be included in the REST API.
  • 'default'
    (mixed) Default value when calling get_option().

Default value: array()

Source

File: wp-includes/option.php 

function register_setting( $option_group, $option_name, $args = array() ) {
	global $new_whitelist_options, $wp_registered_settings;

	$defaults = array(
		'type'              => 'string',
		'group'             => $option_group,
		'description'       => '',
		'sanitize_callback' => null,
		'show_in_rest'      => false,
	);

	// Back-compat: old sanitize callback is added.
	if ( is_callable( $args ) ) {
		$args = array(
			'sanitize_callback' => $args,
		);
	}

	/**
	 * Filters the registration arguments when registering a setting.
	 *
	 * @since WP-4.7.0
	 *
	 * @param array  $args         Array of setting registration arguments.
	 * @param array  $defaults     Array of default arguments.
	 * @param string $option_group Setting group.
	 * @param string $option_name  Setting name.
	 */
	$args = apply_filters( 'register_setting_args', $args, $defaults, $option_group, $option_name );
	$args = wp_parse_args( $args, $defaults );

	if ( ! is_array( $wp_registered_settings ) ) {
		$wp_registered_settings = array();
	}

	if ( 'misc' == $option_group ) {
		_deprecated_argument( __FUNCTION__, 'WP-3.0.0',
			/* translators: %s: misc */
			sprintf( __( 'The "%s" options group has been removed. Use another settings group.' ),
				'misc'
			)
		);
		$option_group = 'general';
	}

	if ( 'privacy' == $option_group ) {
		_deprecated_argument( __FUNCTION__, 'WP-3.5.0',
			/* translators: %s: privacy */
			sprintf( __( 'The "%s" options group has been removed. Use another settings group.' ),
				'privacy'
			)
		);
		$option_group = 'reading';
	}

	$new_whitelist_options[ $option_group ][] = $option_name;
	if ( ! empty( $args['sanitize_callback'] ) ) {
		add_filter( "sanitize_option_{$option_name}", $args['sanitize_callback'] );
	}
	if ( array_key_exists( 'default', $args ) ) {
		add_filter( "default_option_{$option_name}", 'filter_default_option', 10, 3 );
	}

	$wp_registered_settings[ $option_name ] = $args;
}

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Related

Uses

Uses
Uses Description
wp-includes/l10n.php: __()

Retrieve the translation of $text.
wp-includes/plugin.php: apply_filters()

Call the functions added to a filter hook.
wp-includes/plugin.php: add_filter()

Hook a function or method to a specific filter action.
wp-includes/option.php: register_setting_args

Filters the registration arguments when registering a setting.
wp-includes/functions.php: _deprecated_argument()

Mark a function argument as deprecated and inform when it has been used.
wp-includes/functions.php: wp_parse_args()

Merge user defined arguments into defaults array.
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Changelog

Changelog
Version Description
WP-4.7.0 $args can be passed to set flags on the setting, similar to register_meta().
WP-2.7.0 Introduced.