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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 |
|---|---|
| 1306 | * Filter whether a blogname is taken. |
| 1307 | * |
| 1308 | * @since 3.5.0 |
| 1309 | * |
| 1310 | * @param int|null $result The blog_id if the blogname exists, null otherwise. |
| 1311 | * @param string $domain Domain to be checked. |
| 1312 | * @param string $path Path to be checked. |
| 1313 | * @param int $site_id Site ID. Relevant only on multi-network installs. |
| 1314 | */ |
| 1315 | return apply_filters( 'domain_exists', $result, $domain, $path, $site_id ); |
| 1316 | } |
| 1317 | |
| 1318 | /** |
| 1319 | * Store basic site info in the blogs table. |
| 1320 | * |
| 1321 | * This function creates a row in the wp_blogs table and returns |
| 1322 | * the new blog's ID. It is the first step in creating a new blog. |
| 1323 | * |
| 1324 | * @since MU |