http://codex.wordpress.org/Settings_API adresinden alıntı

gistfile1.php

<?php 
 // ------------------------------------------------------------------
 // Add all your sections, fields and settings during admin_init
 // ------------------------------------------------------------------
 //
 
 function eg_settings_api_init() {
 	// Add the section to reading settings so we can add our fields to it
 	add_settings_section('eg_setting_section', 'Example settings section in reading', 'eg_setting_section_callback_function', 'reading');
 	
 	// Add the field with the names and function to use for our new settings, put it in our new section
 	add_settings_field('eg_setting_name', 'Example setting Name', 'eg_setting_callback_function', 'reading', 'eg_setting_section');
 	
 	// Register our setting so that $_POST handling is done for us and our callback function just has to echo the <input>
 	register_setting('reading','eg_setting_name');
 }// eg_settings_api_init()
 
 add_action('admin_init', 'eg_settings_api_init');
 
  
 // ------------------------------------------------------------------
 // Settings section callback function
 // ------------------------------------------------------------------
 //
 // This function is needed if we added a new section. This function 
 // will be run at the start of our section
 //
 
 function eg_setting_section_callback_function() {
 	echo '<p>Intro text for our settings section</p>';
 }
 
 // ------------------------------------------------------------------
 // Callback function for our example setting
 // ------------------------------------------------------------------
 //
 // creates a checkbox true/false option. Other types are surely possible
 //
 
 function eg_setting_callback_function() {
 	echo '<input name="eg_setting_name" id="gv_thumbnails_insert_into_excerpt" type="checkbox" value="1" class="code" ' . checked( 1, get_option('eg_setting_name'), false ) . ' /> Explanation text';
 }