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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 |
|---|---|
| 58 | $nickname = $user_login; |
| 59 | $nickname = apply_filters('pre_user_nickname', $nickname); |
| 60 | |
| 61 | if ( empty($first_name) ) |
| 62 | $first_name = ''; |
| 63 | $first_name = apply_filters('pre_user_first_name', $first_name); |
| 64 | |
| 65 | if ( empty($last_name) ) |
| 66 | $last_name = ''; |
| 67 | $last_name = apply_filters('pre_user_last_name', $last_name); |
| 68 | |
| 69 | if ( empty($description) ) |
| 70 | $description = ''; |
| 71 | $description = apply_filters('pre_user_description', $description); |
| 72 | |
| 73 | if ( empty($user_registered) ) |
| 74 | $user_registered = gmdate('Y-m-d H:i:s'); |
| 75 | |
| 76 | if ( $update ) { |