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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 1857 |            * @since 2.9.0 As "update_site_option_{$key}" | 
| 1858 |            * @since 3.0.0 | 
| 1859 |            * @since 4.7.0 The `$network_id` parameter was added. | 
| 1860 |            * | 
| 1861 |            * @param string $option     Name of the network option. | 
| 1862 |            * @param mixed  $value      Current value of the network option. | 
| 1863 |            * @param mixed  $old_value  Old value of the network option. | 
| 1864 |            * @param int    $network_id ID of the network. | 
| 1865 |            */ | 
| 1866 |           do_action( "update_site_option_{$option}", $option, $value, $old_value, $network_id ); | 
| 1867 |  | 
| 1868 |           /** | 
| 1869 |            * Fires after the value of a network option has been successfully updated. | 
| 1870 |            * | 
| 1871 |            * @since 3.0.0 | 
| 1872 |            * @since 4.7.0 The `$network_id` parameter was added. | 
| 1873 |            * | 
| 1874 |            * @param string $option     Name of the network option. | 
| 1875 |            * @param mixed  $value      Current value of the network option. |