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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 |
|---|---|
| 1917 | $nickname = empty( $userdata['nickname'] ) ? $user_login : $userdata['nickname']; |
| 1918 | |
| 1919 | /** |
| 1920 | * Filters a user's nickname before the user is created or updated. |
| 1921 | * |
| 1922 | * @since 2.0.3 |
| 1923 | * |
| 1924 | * @param string $nickname The user's nickname. |
| 1925 | */ |
| 1926 | $meta['nickname'] = apply_filters( 'pre_user_nickname', $nickname ); |
| 1927 | |
| 1928 | $first_name = empty( $userdata['first_name'] ) ? '' : $userdata['first_name']; |
| 1929 | |
| 1930 | /** |
| 1931 | * Filters a user's first name before the user is created or updated. |
| 1932 | * |
| 1933 | * @since 2.0.3 |
| 1934 | * |
| 1935 | * @param string $first_name The user's first name. |