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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 |
|---|---|
| 111 | $update = true; |
| 112 | $old_user_data = get_userdata($ID); |
| 113 | } else { |
| 114 | $update = false; |
| 115 | // Hash the password |
| 116 | $user_pass = wp_hash_password($user_pass); |
| 117 | } |
| 118 | |
| 119 | $user_login = sanitize_user($user_login, true); |
| 120 | $user_login = apply_filters('pre_user_login', $user_login); |
| 121 | |
| 122 | //Remove any non-printable chars from the login string to see if we have ended up with an empty username |
| 123 | $user_login = trim($user_login); |
| 124 | |
| 125 | if ( empty($user_login) ) |
| 126 | return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') ); |
| 127 | |
| 128 | if ( !$update && username_exists( $user_login ) ) |
| 129 | return new WP_Error('existing_user_login', __('This username is already registered.') ); |