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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 |
|---|---|
| 1374 | * path depending on the network settings. |
| 1375 | * |
| 1376 | * @since 3.5.0 |
| 1377 | * |
| 1378 | * @param int|null $result The site ID if the site name exists, null otherwise. |
| 1379 | * @param string $domain Domain to be checked. |
| 1380 | * @param string $path Path to be checked. |
| 1381 | * @param int $network_id Network ID. Relevant only on multi-network installations. |
| 1382 | */ |
| 1383 | return apply_filters( 'domain_exists', $result, $domain, $path, $network_id ); |
| 1384 | } |
| 1385 | |
| 1386 | /** |
| 1387 | * Store basic site info in the blogs table. |
| 1388 | * |
| 1389 | * This function creates a row in the wp_blogs table and returns |
| 1390 | * the new blog's ID. It is the first step in creating a new blog. |
| 1391 | * |
| 1392 | * @since MU (3.0.0) |