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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 |
---|---|
1278 | * Filter whether a blogname is taken. |
1279 | * |
1280 | * @since 3.5.0 |
1281 | * |
1282 | * @param int|null $result The blog_id if the blogname exists, null otherwise. |
1283 | * @param string $domain Domain to be checked. |
1284 | * @param string $path Path to be checked. |
1285 | * @param int $site_id Site ID. Relevant only on multi-network installs. |
1286 | */ |
1287 | return apply_filters( 'domain_exists', $result, $domain, $path, $site_id ); |
1288 | } |
1289 |
|
1290 | /** |
1291 | * Store basic site info in the blogs table. |
1292 | * |
1293 | * This function creates a row in the wp_blogs table and returns |
1294 | * the new blog's ID. It is the first step in creating a new blog. |
1295 | * |
1296 | * @since MU |