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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 |
|---|---|
| 1347 | $nickname = $user_login; |
| 1348 | $nickname = apply_filters('pre_user_nickname', $nickname); |
| 1349 | |
| 1350 | if ( empty($first_name) ) |
| 1351 | $first_name = ''; |
| 1352 | $first_name = apply_filters('pre_user_first_name', $first_name); |
| 1353 | |
| 1354 | if ( empty($last_name) ) |
| 1355 | $last_name = ''; |
| 1356 | $last_name = apply_filters('pre_user_last_name', $last_name); |
| 1357 | |
| 1358 | if ( empty( $display_name ) ) { |
| 1359 | if ( $update ) |
| 1360 | $display_name = $user_login; |
| 1361 | elseif ( $first_name && $last_name ) |
| 1362 | /* translators: 1: first name, 2: last name */ |
| 1363 | $display_name = sprintf( _x( '%1$s %2$s', 'Display name based on first name and last name' ), $first_name, $last_name ); |
| 1364 | elseif ( $first_name ) |
| 1365 | $display_name = $first_name; |