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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 |
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185 | if ( ! $update && isset( $_POST['user_login'] ) && ! validate_username( $_POST['user_login'] ) ) { |
186 | $errors->add( 'user_login', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
187 | } |
188 |
|
189 | if ( ! $update && username_exists( $user->user_login ) ) { |
190 | $errors->add( 'user_login', __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' ) ); |
191 | } |
192 |
|
193 | /** This filter is documented in wp-includes/user.php */ |
194 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
195 |
|
196 | if ( in_array( strtolower( $user->user_login ), array_map( 'strtolower', $illegal_logins ) ) ) { |
197 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: Sorry, that username is not allowed.' ) ); |
198 | } |
199 |
|
200 | /* checking email address */ |
201 | if ( empty( $user->user_email ) ) { |
202 | $errors->add( 'empty_email', __( '<strong>ERROR</strong>: Please enter an email address.' ), array( 'form-field' => 'email' ) ); |
203 | } elseif ( ! is_email( $user->user_email ) ) { |