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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 |
|---|---|
| 1110 | */ |
| 1111 | public function check_username( $value, $request, $param ) { |
| 1112 | $username = (string) $value; |
| 1113 | |
| 1114 | if ( ! validate_username( $username ) ) { |
| 1115 | return new WP_Error( 'rest_user_invalid_username', __( 'Username contains invalid characters.' ), array( 'status' => 400 ) ); |
| 1116 | } |
| 1117 | |
| 1118 | /** This filter is documented in wp-includes/user.php */ |
| 1119 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 1120 | |
| 1121 | if ( in_array( strtolower( $username ), array_map( 'strtolower', $illegal_logins ) ) ) { |
| 1122 | return new WP_Error( 'rest_user_invalid_username', __( 'Sorry, that username is not allowed.' ), array( 'status' => 400 ) ); |
| 1123 | } |
| 1124 | |
| 1125 | return $username; |
| 1126 | } |
| 1127 | |
| 1128 | /** |