WP_Customize_Setting::save(): void|false

Source

final public function save() {
	$value = $this->post_value();

	if ( ! $this->check_capabilities() || ! isset( $value ) ) {
		return false;
	}

	$id_base = $this->id_data['base'];

	/**
	 * Fires when the WP_Customize_Setting::save() method is called.
	 *
	 * The dynamic portion of the hook name, `$id_base` refers to
	 * the base slug of the setting name.
	 *
	 * @since 3.4.0
	 *
	 * @param WP_Customize_Setting $setting WP_Customize_Setting instance.
	 */
	do_action( "customize_save_{$id_base}", $this );

	$this->update( $value );
}

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