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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 |
|---|---|
| 1330 | |
| 1331 | /** |
| 1332 | * Filters whether the given username exists or not. |
| 1333 | * |
| 1334 | * @since 4.9.0 |
| 1335 | * |
| 1336 | * @param int|false $user_id The user's ID on success, and false on failure. |
| 1337 | * @param string $username Username to check. |
| 1338 | */ |
| 1339 | return apply_filters( 'username_exists', $user_id, $username ); |
| 1340 | } |
| 1341 | |
| 1342 | /** |
| 1343 | * Checks whether the given email exists. |
| 1344 | * |
| 1345 | * @since 2.1.0 |
| 1346 | * |
| 1347 | * @param string $email Email. |
| 1348 | * @return int|false The user's ID on success, and false on failure. |