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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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1609 | /** |
1610 | * Filters whether the given username exists. |
1611 | * |
1612 | * @since 4.9.0 |
1613 | * |
1614 | * @param int|false $user_id The user ID associated with the username, |
1615 | * or false if the username does not exist. |
1616 | * @param string $username The username to check for existence. |
1617 | */ |
1618 | return apply_filters( 'username_exists', $user_id, $username ); |
1619 | } |
1620 |
|
1621 | /** |
1622 | * Determines whether the given email exists. |
1623 | * |
1624 | * For more information on this and similar theme functions, check out |
1625 | * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ |
1626 | * Conditional Tags} article in the Theme Developer Handbook. |
1627 | * |