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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 |
|---|---|
| 2023 | /** |
| 2024 | * Filters whether the given email exists. |
| 2025 | * |
| 2026 | * @since 5.6.0 |
| 2027 | * |
| 2028 | * @param int|false $user_id The user ID associated with the email, |
| 2029 | * or false if the email does not exist. |
| 2030 | * @param string $email The email to check for existence. |
| 2031 | */ |
| 2032 | return apply_filters( 'email_exists', $user_id, $email ); |
| 2033 | } |
| 2034 | |
| 2035 | /** |
| 2036 | * Checks whether a username is valid. |
| 2037 | * |
| 2038 | * @since 2.0.1 |
| 2039 | * @since 4.4.0 Empty sanitized usernames are now considered invalid. |
| 2040 | * |
| 2041 | * @param string $username Username. |