Title: add_settings_error on validating plugin options API
Last modified: August 18, 2017

---

# add_settings_error on validating plugin options API

 *  [ParsMizban](https://wordpress.org/support/users/parsmizban/)
 * (@parsmizban)
 * [8 years, 9 months ago](https://wordpress.org/support/topic/add_settings_error-on-validating-plugin-options-api/)
 * I am developing a plugin which uses options API.
 * I defined a class that uses a function to sanitize the inputs, but when I submit
   the options form, It displays errors and info twice.
 * And also I didn’t succeed at displaying the error messages.
 * What is the proper way to display the successful and error messages on validation
   of options form?
 * Thank you.
 *     ```
       register_setting(
           $this->plugin_slug, // option_group
           $this->plugin_slug, // option_name, for name property of tags
           [$this, 'process_inputs'] // sanitize_callback
       );
   
       public function process_inputs( $input ){
           // sanitize functions:
           // sanitize_email(), sanitize_file_name(), sanitize_html_class(), sanitize_key(), sanitize_meta(), sanitize_mime_type(),
           // sanitize_option(), sanitize_sql_orderby(), sanitize_text_field(), sanitize_textarea_field(), sanitize_title(),
           // sanitize_title_for_query(), sanitize_title_with_dashes(), sanitize_user()
           $options = [];
           if( isset( $input['frontend-font'] ) and $input['frontend-font'] == true ) {
               $options['frontend-font'] = true;
           }else{
               $options['frontend-font'] = false;
           }
           if( isset( $input['backend-font'] ) and $input['backend-font'] == true ){
               $options['backend-font'] = true;
           }else{
               $options['backend-font'] = false;
           }
   
           // add error/update messages
           // check if the user have submitted the settings
           // wordpress will add the "settings-updated" $_GET parameter to the url
           if ( isset( $_GET['settings-updated'] ) ) {
               // add settings saved message with the class of "updated"*/
               add_settings_error(
                   'persianfont_messages', // Slug title of setting
                   'wporg_message', // Slug-name , Used as part of 'id' attribute in HTML output.
                   __( 'settings saved.', 'persianfont' ), // message text, will be shown inside styled <div> and <p> tags
                   'error' // Message type, controls HTML class. Accepts 'error' or 'updated'.
               );
           }
   
           return $options;
       }
           /**
            * Settings page display callback.
            */
           function settings_page_content() {
       		// check user capabilities
       		if ( ! current_user_can( 'manage_options' ) ) { return; }
   
       		//var_dump( wp_load_alloptions() ); // print all options
   
       		// show error/update messages
       		settings_errors( 'persianfont_messages' );
       		?>
       		<div class="wrap">
       			<h1 class="wp-heading-inline"><?php echo esc_html($this->page_title); ?></h1>
       			<form method="post" action="options.php">
       			<?php
       				submit_button();
       				settings_fields( $this->plugin_slug ); // This prints out all hidden setting fields
       				do_settings_sections( $this->plugin_slug );
       				submit_button();
       			?>
       			</form>
       		</div>
       		<?php
           }
       ```
   
    -  This topic was modified 8 years, 9 months ago by [ParsMizban](https://wordpress.org/support/users/parsmizban/).

Viewing 1 replies (of 1 total)

 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [8 years, 9 months ago](https://wordpress.org/support/topic/add_settings_error-on-validating-plugin-options-api/#post-9423940)
 * You need to tell register_setting() what argument you are passing.
 *     ```
       register_setting(
           $this->plugin_slug, // option_group
           $this->plugin_slug, // option_name, for name property of tags
           ['sanitize_callback'=>[$this, 'process_inputs'], // sanitize_callback
           ]
       );
       ```
   
 * There are all sorts of [arguments](https://developer.wordpress.org/reference/functions/register_setting/#parameters)
   you can pass in the third $args parameter.

Viewing 1 replies (of 1 total)

The topic ‘add_settings_error on validating plugin options API’ is closed to new
replies.

## Tags

 * [plugin-development](https://wordpress.org/support/topic-tag/plugin-development/)

 * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/)
 * 1 reply
 * 2 participants
 * Last reply from: [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * Last activity: [8 years, 9 months ago](https://wordpress.org/support/topic/add_settings_error-on-validating-plugin-options-api/#post-9423940)
 * Status: not resolved

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