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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 |
|---|---|
| 1886 | $raw_user_email = empty( $userdata['user_email'] ) ? '' : $userdata['user_email']; |
| 1887 | |
| 1888 | /** |
| 1889 | * Filter a user's email before the user is created or updated. |
| 1890 | * |
| 1891 | * @since 2.0.3 |
| 1892 | * |
| 1893 | * @param string $raw_user_email The user's email. |
| 1894 | */ |
| 1895 | $user_email = apply_filters( 'pre_user_email', $raw_user_email ); |
| 1896 | |
| 1897 | /* |
| 1898 | * If there is no update, just check for `email_exists`. If there is an update, |
| 1899 | * check if current email and new email are the same, or not, and check `email_exists` |
| 1900 | * accordingly. |
| 1901 | */ |
| 1902 | if ( ( ! $update || ( ! empty( $old_user_data ) && $user_email !== $old_user_data->user_email ) ) |
| 1903 | && ! defined( 'WP_IMPORTING' ) |
| 1904 | && email_exists( $user_email ) |