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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 |
|---|---|
| 6246 | } |
| 6247 | |
| 6248 | /** |
| 6249 | * Filters the main network ID. |
| 6250 | * |
| 6251 | * @since 4.3.0 |
| 6252 | * |
| 6253 | * @param int $main_network_id The ID of the main network. |
| 6254 | */ |
| 6255 | return (int) apply_filters( 'get_main_network_id', $main_network_id ); |
| 6256 | } |
| 6257 | |
| 6258 | /** |
| 6259 | * Determines whether site meta is enabled. |
| 6260 | * |
| 6261 | * This function checks whether the 'blogmeta' database table exists. The result is saved as |
| 6262 | * a setting for the main network, making it essentially a global setting. Subsequent requests |
| 6263 | * will refer to this setting instead of running the query. |
| 6264 | * |