WordPress at a glance
action is not described

customize_save_(id_base) action-hook . WP 3.4.0

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.

Usage

add_action( 'customize_save_(id_base)', 'action_function_name_7221' );
function action_function_name_7221( $this ){
	// action...
}
$this(WP_Customize_Setting)
WP_Customize_Setting instance.

Where the hook is called

WP_Customize_Setting::save()
wp-includes/class-wp-customize-setting.php 524
do_action( "customize_save_{$id_base}", $this );

Where the hook is used (in WP core)

wp-includes/customize/class-wp-customize-nav-menu-setting.php 482
add_filter( 'customize_save_response', array( $this, 'amend_customize_save_response' ) );
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php 756
add_filter( 'customize_save_response', array( $this, 'amend_customize_save_response' ) );
wp-includes/class-wp-customize-nav-menus.php 52
add_action( 'customize_save_nav_menus_created_posts', array( $this, 'save_nav_menus_created_posts' ) );
wp-admin/custom-header.php 61
add_action( 'customize_save_after', array( $this, 'customize_set_last_used' ) );