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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 |
|---|---|
| 1347 | |
| 1348 | /** |
| 1349 | * Filters whether the provided username is valid or not. |
| 1350 | * |
| 1351 | * @since 2.0.1 |
| 1352 | * |
| 1353 | * @param bool $valid Whether given username is valid. |
| 1354 | * @param string $username Username to check. |
| 1355 | */ |
| 1356 | return apply_filters( 'validate_username', $valid, $username ); |
| 1357 | } |
| 1358 | |
| 1359 | /** |
| 1360 | * Insert a user into the database. |
| 1361 | * |
| 1362 | * Most of the `$userdata` array fields have filters associated with the values. Exceptions are |
| 1363 | * 'ID', 'rich_editing', 'comment_shortcuts', 'admin_color', 'use_ssl', |
| 1364 | * 'user_registered', and 'role'. The filters have the prefix 'pre_user_' followed by the field |
| 1365 | * name. An example using 'description' would have the filter called, 'pre_user_description' that |