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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 |
|---|---|
| 1974 | /** |
| 1975 | * Filters whether the given email exists. |
| 1976 | * |
| 1977 | * @since 5.6.0 |
| 1978 | * |
| 1979 | * @param int|false $user_id The user ID associated with the email, |
| 1980 | * or false if the email does not exist. |
| 1981 | * @param string $email The email to check for existence. |
| 1982 | */ |
| 1983 | return apply_filters( 'email_exists', $user_id, $email ); |
| 1984 | } |
| 1985 | |
| 1986 | /** |
| 1987 | * Checks whether a username is valid. |
| 1988 | * |
| 1989 | * @since 2.0.1 |
| 1990 | * @since 4.4.0 Empty sanitized usernames are now considered invalid. |
| 1991 | * |
| 1992 | * @param string $username Username. |