ame.
		 */
		do_action( 'unregister_setting', $option_group, $option_name );

		unset( $wp_registered_settings[ $option_name ] );
	}
}

/**
 * Retrieves an array of registered settings.
 *
 * @since 4.7.0
 *
 * @global array $wp_registered_settings
 *
 * @return array List of registered settings, keyed by option name.
 */
function get_registered_settings() {
	global $wp_registered_settings;

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

	return $wp_registered_settings;
}

/**
 * Filters the default value for the option.
 *
 * For settings which register a default setting in `register_setting()`, this
 * function is added as a filter to `default_option_{$option}`.
 *
 * @since 4.7.0
 *
 * @param mixed  $default_value  Existing default value to return.
 * @param string $option         Option name.
 * @param bool   $passed_default Was `get_option()` passed a default value?
 * @return mixed Filtered default value.
 */
function filter_default_option( $default_value, $option, $passed_default ) {
	if ( $passed_default ) {
		return $default_value;
	}

	$registered = get_registered_settings();
	if ( empty( $registered[ $option ] ) ) {
		return $default_value;
	}

	return $registered[ $option ]['default'];
}
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function wp_load_alloptions() in /home/sportuga/public_html/wp-includes/functions.php:1778
Stack trace:
#0 /home/sportuga/public_html/wp-includes/load.php(905): is_blog_installed()
#1 /home/sportuga/public_html/wp-settings.php(173): wp_not_installed()
#2 /home/sportuga/public_html/wp-config.php(102): require_once('/home/sportuga/...')
#3 /home/sportuga/public_html/wp-load.php(50): require_once('/home/sportuga/...')
#4 /home/sportuga/public_html/wp-blog-header.php(13): require_once('/home/sportuga/...')
#5 /home/sportuga/public_html/index.php(17): require('/home/sportuga/...')
#6 {main}
  thrown in <b>/home/sportuga/public_html/wp-includes/functions.php</b> on line <b>1778</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function get_option() in /home/sportuga/public_html/wp-includes/l10n.php:63
Stack trace:
#0 /home/sportuga/public_html/wp-includes/l10n.php(165): get_locale()
#1 /home/sportuga/public_html/wp-includes/l10n.php(947): determine_locale()
#2 /home/sportuga/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#3 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#4 {main}
  thrown in <b>/home/sportuga/public_html/wp-includes/l10n.php</b> on line <b>63</b><br />