Generic WP Option Page Functions

admin-options.php

<?php

/**
 * Generic WordPress Options Panel
 *
 * A good starting point for a simple options panel, just
 * loops through defined options and creates input[type=text]
 * for each with the value and lets you update.
 *
 * Replace namespace- and namespace_ with either your plugin
 * namespace or class definitions. Also search for instances
 * of unique- in the below for items that should be changed.
 */

// Add our options panel link.
add_action('admin_menu', 'namespace_menu_item');
function namespace_menu_item () {
  // Page Title, Menu Title, User Capability, Menu Slug (Unique), Output Function
  add_options_page( 'Options', 'Options', 'manage_options', 'namespace-', 'namespace_options_page');
}

// Define our database options. Central definition in one place.
function namespace_option_definitions() {
  return array(
    'option_key' => 'Option Name',
   );
}

/**
 * Retrieve our database options. Note the use of $definitions
 * as a function call. This allows extending and creating more
 * than one set of option definitions if needed.
 */
function namespace_option_values($definitions=null) {
  if(!$definitions) return false;
  
  // Get our option definitions.
  $option_definitions = $definitions();
  // Return array for current option values.
  $current_options = array();
  
  // Loop de loop.
  foreach($option_definitions as $key => $name) {
    // Store current options in return array.
    $current_options[$key] = get_option($key);
  }

  // Return current option values.
  return $current_options;
}

function namespace_options_page() {
    
  // Rejection!
  if (!current_user_can('manage_options')) {
    wp_die(__('You do not have sufficient permissions to access this page.'));
  }

  // Define our options saved in DB. Matches on inputs by name == value.
  $option_definitions = namespace_option_definitions();

  // Display message.
  $option_alert = false;

  // Update option values if needed.
  if(isset($_POST['update-options'])) {
    foreach($option_definitions as $key => $name) {
      if(isset($_POST[$key])) {
        update_option($key, $_POST[$key]);
        $option_alert = true;
      }
    }
  }

  $current_options = namespace_option_values('option_definitions');

  // General Header stuff.
  echo '<div class="wrap">';
  echo '<h2>'.__('Options', 'unique-slug').'</h2>';

  // Options updated feedback.
  echo $option_alert ? '<div class="updated fade"><p><strong>Options updated.</strong></p></div>' : '';

  // Option update form.
  echo '<form name="unique-form-name" method="post" action="">';
  echo '<table class="form-table">';

  // Add our options.
  foreach($current_options as $key => $name) {
    echo '<tr><th scope="row"><label for="'.$key.'">'.$option_definitions[$key].':</label></th><td><input id="'.$key.'" type="text" name="'.$key.'" value="'.$current_options[$key].'" size="3"></td></tr>';
  }
  
  // Footer/Close
  echo '</table>';
  echo '<p class="submit"><input type="submit" name="update-options" class="button-primary" value="Save Changes"></p>';
  echo '</form>';

}