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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 |
---|---|
1283 |
|
1284 | /** |
1285 | * Fires immediately after the given user's cache is cleaned. |
1286 | * |
1287 | * @since 4.4.0 |
1288 | * |
1289 | * @param int $user_id User ID. |
1290 | * @param WP_User $user User object. |
1291 | */ |
1292 | do_action( 'clean_user_cache', $user->ID, $user ); |
1293 | } |
1294 |
|
1295 | /** |
1296 | * Checks whether the given username exists. |
1297 | * |
1298 | * @since 2.0.0 |
1299 | * |
1300 | * @param string $username Username. |
1301 | * @return int|false The user's ID on success, and false on failure. |