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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 |
|---|---|
| 1666 | /** |
| 1667 | * Filters whether the given email exists. |
| 1668 | * |
| 1669 | * @since 5.6.0 |
| 1670 | * |
| 1671 | * @param int|false $user_id The user ID associated with the email, |
| 1672 | * or false if the email does not exist. |
| 1673 | * @param string $email The email to check for existence. |
| 1674 | */ |
| 1675 | return apply_filters( 'email_exists', $user_id, $email ); |
| 1676 | } |
| 1677 | |
| 1678 | /** |
| 1679 | * Checks whether a username is valid. |
| 1680 | * |
| 1681 | * @since 2.0.1 |
| 1682 | * @since 4.4.0 Empty sanitized usernames are now considered invalid. |
| 1683 | * |
| 1684 | * @param string $username Username. |