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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 |
|---|---|
| 477 | if ( ! is_array( $illegal_names ) ) { |
| 478 | $illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' ); |
| 479 | add_site_option( 'illegal_names', $illegal_names ); |
| 480 | } |
| 481 | if ( in_array( $user_name, $illegal_names, true ) ) { |
| 482 | $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) ); |
| 483 | } |
| 484 | |
| 485 | /** This filter is documented in wp-includes/user.php */ |
| 486 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 487 | |
| 488 | if ( in_array( strtolower( $user_name ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 489 | $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) ); |
| 490 | } |
| 491 | |
| 492 | if ( ! is_email( $user_email ) ) { |
| 493 | $errors->add( 'user_email', __( 'Please enter a valid email address.' ) ); |
| 494 | } elseif ( is_email_address_unsafe( $user_email ) ) { |
| 495 | $errors->add( 'user_email', __( 'You cannot use that email address to signup. There are problems with them blocking some emails from WordPress. Please use another email provider.' ) ); |