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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 |
|---|---|
| 426 | if ( ! is_array( $illegal_names ) ) { |
| 427 | $illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' ); |
| 428 | add_site_option( 'illegal_names', $illegal_names ); |
| 429 | } |
| 430 | if ( in_array( $user_name, $illegal_names ) ) { |
| 431 | $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) ); |
| 432 | } |
| 433 | |
| 434 | /** This filter is documented in wp-includes/user.php */ |
| 435 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 436 | |
| 437 | if ( in_array( strtolower( $user_name ), array_map( 'strtolower', $illegal_logins ) ) ) { |
| 438 | $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) ); |
| 439 | } |
| 440 | |
| 441 | if ( is_email_address_unsafe( $user_email ) ) |
| 442 | $errors->add('user_email', __('You cannot use that email address to signup. We are having problems with them blocking some of our email. Please use another email provider.')); |
| 443 | |
| 444 | if ( strlen( $user_name ) < 4 ) |