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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 |
|---|---|
| 158 | $user->user_pass = $pass1; |
| 159 | |
| 160 | if ( !$update && isset( $_POST['user_login'] ) && !validate_username( $_POST['user_login'] ) ) |
| 161 | $errors->add( 'user_login', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' )); |
| 162 | |
| 163 | if ( !$update && username_exists( $user->user_login ) ) |
| 164 | $errors->add( 'user_login', __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' )); |
| 165 | |
| 166 | /** This filter is documented in wp-includes/user.php */ |
| 167 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 168 | |
| 169 | if ( in_array( strtolower( $user->user_login ), array_map( 'strtolower', $illegal_logins ) ) ) { |
| 170 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: Sorry, that username is not allowed.' ) ); |
| 171 | } |
| 172 | |
| 173 | /* checking email address */ |
| 174 | if ( empty( $user->user_email ) ) { |
| 175 | $errors->add( 'empty_email', __( '<strong>ERROR</strong>: Please enter an email address.' ), array( 'form-field' => 'email' ) ); |
| 176 | } elseif ( !is_email( $user->user_email ) ) { |