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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 |
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1334 |
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1335 | /** |
1336 | * Filters whether the given username exists or not. |
1337 | * |
1338 | * @since 4.9.0 |
1339 | * |
1340 | * @param int|false $user_id The user's ID on success, and false on failure. |
1341 | * @param string $username Username to check. |
1342 | */ |
1343 | return apply_filters( 'username_exists', $user_id, $username ); |
1344 | } |
1345 |
|
1346 | /** |
1347 | * Determines whether the given email exists. |
1348 | * |
1349 | * For more information on this and similar theme functions, check out |
1350 | * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ |
1351 | * Conditional Tags} article in the Theme Developer Handbook. |
1352 | * |