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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 |
|---|---|
| 1281 | * Filter whether a blogname is taken. |
| 1282 | * |
| 1283 | * @since 3.5.0 |
| 1284 | * |
| 1285 | * @param int|null $result The blog_id if the blogname exists, null otherwise. |
| 1286 | * @param string $domain Domain to be checked. |
| 1287 | * @param string $path Path to be checked. |
| 1288 | * @param int $site_id Site ID. Relevant only on multi-network installs. |
| 1289 | */ |
| 1290 | return apply_filters( 'domain_exists', $result, $domain, $path, $site_id ); |
| 1291 | } |
| 1292 | |
| 1293 | /** |
| 1294 | * Store basic site info in the blogs table. |
| 1295 | * |
| 1296 | * This function creates a row in the wp_blogs table and returns |
| 1297 | * the new blog's ID. It is the first step in creating a new blog. |
| 1298 | * |
| 1299 | * @since MU |