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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 |
|---|---|
| 1424 | |
| 1425 | /** |
| 1426 | * Filters whether the given username exists or not. |
| 1427 | * |
| 1428 | * @since 4.9.0 |
| 1429 | * |
| 1430 | * @param int|false $user_id The user's ID on success, and false on failure. |
| 1431 | * @param string $username Username to check. |
| 1432 | */ |
| 1433 | return apply_filters( 'username_exists', $user_id, $username ); |
| 1434 | } |
| 1435 | |
| 1436 | /** |
| 1437 | * Determines whether the given email exists. |
| 1438 | * |
| 1439 | * For more information on this and similar theme functions, check out |
| 1440 | * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ |
| 1441 | * Conditional Tags} article in the Theme Developer Handbook. |
| 1442 | * |