A class to handle the Wordpress Settings API

class-controllerSettingsApi.php

class Form_Controller {

    function __construct() {

    } // end construct


    public function ah_config_settings() {

        // put together the output array
        $output['ah_option_name'] = 'affiliate_hoover_plugin_options';
        // the option name as used in the get_option() call.
        $output['ah_page_title'] = 'Affiliate Hoover'; // the settings page title
        $output['ah_page_url'] = 'affiliate-hoover-plugin-admin';
        $output['ah_form_sections'] = Form_Controller::ah_options_page_sections(); // the setting section
        $output['ah_form_fields_hook'] = Form_Controller::ah_form_fields(); // the setting fields
        //$output['ah_contextual_help'] = ''; // the contextual help

        return $output;
    }

    public function ah_options_page_sections() {

        $sections = array(); //$sections[$id] 		= $title;
        $sections['txt_section'] = 'Text area Form Fields';
        //$sections['txtarea_section'] = 'Textarea Form Fields';
        //$sections['select_section'] = 'Select Form Fields';
        //$sections['checkbox_section'] = 'Checkbox Form Fields';

        return $sections;
    }

    public function ah_form_fields() {

        $options = array();

        $options[] = array(
            "id" => "ah_url_name_input",
            "title" => 'Give the feed a name here',
            "desc" => '',
            "std" => '',
            "type" => "text",
            "section" => "txt_section",
            "choices" => "",
            "class" => "ah_name"); // Text Form Fields section

        $options[] = array(
            "id" => "ah_url_input",
            "title" => 'Place the fields URL here',
            "desc" => '',
            "std" => '',
            "type" => "text",
            "section" => "txt_section",
            "choices" => "",
            "class" => "ah_email");

        return $options;

    }


    private function ah_form_fields_two($args, $args2 = null) {

        $options = array(
            "id" => null,
            "title" => null,
            "desc" => null,
            "std" => null,
            "type" => null,
            "section" => null,
            "choices" => null,
            "class" => null); // Text Form Fields section

        return array_merge($options, $args, $args2);

    }


    public function ah_merge_database_and_fields() {

        extract(Form_Controller::ah_config_settings());
        
        // take the two arrays from ah_form_fields() and separate them
        foreach (Form_controller::ah_form_fields() as $key => $value) {

            if ($key === 0) {
                $ah_url_name_input = $value;
            }

            if ($key === 1) {
                $ah_url_input = $value;
            }

        } // end foreach

        // call the associated fields from the options field
        $option = get_option($ah_option_name);
        $new_array = array();

        // loop through it and marge it with ah_form_fields_two() keys and null values
        foreach ($option as $result) {

            foreach ($result as $key => $value) {

                if ($key === 'ah_url_name_input') {

                    $new_array[] = Form_controller::ah_form_fields_two($ah_url_name_input, array("std" =>
                            $value));

                } // end if

                if ($key === 'ah_url_input') {

                    $new_array[] = Form_controller::ah_form_fields_two($ah_url_input, array("std" =>
                            $value));

                } // end if

            } // end foreach

        } // end foreach

        // Finally create a final super array merging all the above created arrays into one

        $final_array = array();
        $final_array = $new_array;
        $final_array[] = $ah_url_name_input;
        $final_array[] = $ah_url_input;
        return $final_array;

    }


    public function ah_create_form_fields($args = array()) {

        static $i = 0;

        extract(Form_Controller::ah_config_settings());

        // default array to overwrite when calling the function
        $defaults = array(
            'id' => 'default_field', // the ID of the setting in our options array, and the ID of the HTML form element
            'title' => 'Default Field', // the label for the HTML form element
            'desc' => 'This is a default description.', // the description displayed under the HTML form element
            'std' => '', // the default value for this setting
            'type' => 'text', // the HTML form element to use
            'section' => 'main_section', // the section this setting belongs to — must match the array key of a section in wptuts_options_page_sections()
            'choices' => array(), // (optional): the values in radio buttons or a drop-down menu
            'class' => '' // the HTML form element class. Also used for validation purposes!
                ); // "extract" to be able to use the array keys as variables in our function output below

        extract(wp_parse_args($args, $defaults));

        // additional arguments for use in form field output in the function wptuts_form_field_fn!
        $field_args = array(
            'type' => $type,
            'id' => $id,
            'desc' => $desc,
            'std' => $std,
            'choices' => $choices,
            'label_for' => $id,
            'class' => $class);

        add_settings_field($id.$i++, $title, array('Form_Controller', 'ah_form_field_fn'), $ah_page_url,
            $section, $field_args);

    }


    public function ah_form_field_fn($args = array()) {

        extract($args);
        extract(Form_Controller::ah_config_settings());
        $options = get_option($ah_option_name);

        // DO A LOOP HERE

        if (!isset($options[$id])) {
            $options[$id] = $std;
        }

        // additional field class. output only if the class is defined in the create_setting arguments
        $field_class = ($class !== '') ? ' '.$class : '';

        switch ($type) {
            case 'text':

                $options[$id] = esc_attr(stripslashes($options[$id]));
                echo "<input class='regular-text-$field_class' type='text' id='$id' name='"."$ah_option_name".
                    "[$id]' value='$options[$id]' />";
                echo ($desc !== '') ? "<br /><span class='description'>$desc</span>" : null;

        } // end switch

    } //


    public function ah_validate_options($input) {

        // for enhanced security, create a new empty array
        $valid_input = array();
        $final_array = array();

        extract(Form_Controller::ah_config_settings());

        // run a foreach and switch on option type
        foreach ($ah_form_fields_hook as $option) {


            switch ($option['type']) {
                case 'text':
                    // do something here
                    switch ($option['class']) {
                            //for numeric
                        case 'ah_email':

                            $input[$option['id']] = trim($input[$option['id']]);

                            if (filter_var($input[$option['id']], FILTER_VALIDATE_URL,
                                FILTER_FLAG_PATH_REQUIRED) === false) {

                                add_settings_error($input[$option['id']], 'ah_txt_numeric_error',
                                    'Please make sure that the URL is correct', 'error');

                            } else {

                                $valid_input[$option['id']] = $input[$option['id']];

                            }
                            break;

                        case 'ah_name':

                            $input[$option['id']] = trim($input[$option['id']]);

                            if ($input[$option['id']] === "") {
                                add_settings_error($option['id'], 'ah_txt_numeric_error',
                                    'Please supply a name for the feed', 'error');
                            } else {

                                $valid_input[$option['id']] = $input[$option['id']];

                            }
                            break;

                    } // end second switch
                    break;
            } // end first switch

        } // end foreach loop

        $final_array = array($valid_input);

        return $final_array; // return validated input

    }
}

class-viewSettingsApi.php

class Form_View {

    function __construct() {

        $this->add_action_admin_menu();
        $this->add_action_admin_init();

    } // end construct

    public function add_action_admin_menu() {

        add_action('admin_menu', function () {

            $config_settings = Form_Controller::ah_config_settings();
                //add_action callback function here

            add_options_page('Affiliate Hoover', 'Affiliate Hoover', 'manage_options', $config_settings['ah_page_url'],function () {

                $config_settings = Form_Controller::ah_config_settings(); 
                echo '<div id="wrap">';
                echo screen_icon(); 
                echo "<h2>".$config_settings['ah_page_title']."</h2>"; 
                echo '<p>This is the admin section for Affiliate Hoover plugin</p>'; 
                echo '<form method="post" action="options.php">';
                // http://codex.wordpress.org/Function_Reference/do_settings_sections
                do_settings_sections($config_settings['ah_page_url']);
                // http://codex.wordpress.org/Function_Reference/settings_fields
                settings_fields($config_settings['ah_option_name']); 
                echo '<input type="submit" id="submit" name="submit" class="button-primary" value="Save Changes">';
                echo '</form>'; 
                echo '</div><!-- end wrap div -->'; }
            ); }
        );

    } //


    public function add_action_admin_init() {

        add_action('admin_init', function () {

            $config_settings = Form_Controller::ah_config_settings(); 
            register_setting($config_settings['ah_option_name'], $config_settings['ah_option_name'], array('Form_Controller', 'ah_validate_options'));
            
            // add_settings_section( $id, $title, $callback, $page );
            if (!empty($config_settings['ah_form_sections'])) {

                // call the "add_settings_section" for each!
                foreach ($config_settings['ah_form_sections'] as $id => $title) {

                    add_settings_section($id, $title, function () { echo '<p>This is the beginning the one and only section</p>'; }, $config_settings['ah_page_url']); }
            }

            $option = get_option($config_settings['ah_option_name']); 
         
            // call the "add_settings_field" for each!
                foreach (Form_Controller::ah_merge_database_and_fields() as $options) {

                    Form_Controller::ah_create_form_fields($options); 
                    
                    }// end foreach
            
          
    } // end add_action anon function
    ); // end add_action

}

} // end class

new Form_View();