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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 |
|---|---|
| 1369 | |
| 1370 | /** |
| 1371 | * Filters whether the provided username is valid or not. |
| 1372 | * |
| 1373 | * @since 2.0.1 |
| 1374 | * |
| 1375 | * @param bool $valid Whether given username is valid. |
| 1376 | * @param string $username Username to check. |
| 1377 | */ |
| 1378 | return apply_filters( 'validate_username', $valid, $username ); |
| 1379 | } |
| 1380 | |
| 1381 | /** |
| 1382 | * Insert a user into the database. |
| 1383 | * |
| 1384 | * Most of the `$userdata` array fields have filters associated with the values. Exceptions are |
| 1385 | * 'ID', 'rich_editing', 'syntax_highlighting', 'comment_shortcuts', 'admin_color', 'use_ssl', |
| 1386 | * 'user_registered', and 'role'. The filters have the prefix 'pre_user_' followed by the field |
| 1387 | * name. An example using 'description' would have the filter called, 'pre_user_description' that |