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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 |
|---|---|
| 6437 | } |
| 6438 | |
| 6439 | /** |
| 6440 | * Filters the main network ID. |
| 6441 | * |
| 6442 | * @since 4.3.0 |
| 6443 | * |
| 6444 | * @param int $main_network_id The ID of the main network. |
| 6445 | */ |
| 6446 | return (int) apply_filters( 'get_main_network_id', $main_network_id ); |
| 6447 | } |
| 6448 | |
| 6449 | /** |
| 6450 | * Determines whether site meta is enabled. |
| 6451 | * |
| 6452 | * This function checks whether the 'blogmeta' database table exists. The result is saved as |
| 6453 | * a setting for the main network, making it essentially a global setting. Subsequent requests |
| 6454 | * will refer to this setting instead of running the query. |
| 6455 | * |