Drupal Theme Specific Settings

page.tpl.php

<?php 

/*
 * Usage
 * Insert to specific code block, div or regions
 *
*/

<?php if (theme_get_setting('footer_credits')): ?>
  <span class="credits"><?php print t('Powered by: '); ?>  <a href="http://github.com/danreb/abtik">Abtik Base Theme</a></span>
<?php endif; ?>

theme-settings.php

<?php

/**
 * Implements hook_form_FORM_ID_alter().
 * Example of adding settings in Drupal theme.
 * This adds credits
 */
 
function THEMENAME_form_system_theme_settings_alter(&$form, $form_state) {
  
  $form['THEMENAME_settings']['footer'] = array(
    '#type' => 'fieldset',
    '#title' => t('Footer'),
    '#collapsible' => TRUE,
    '#collapsed' => FALSE,
  ); 
  $form['THEMENAME_settings']['footer']['footer_credits'] = array(
    '#type' => 'checkbox',
    '#title' => t('Show theme credits in footer'),
    '#default_value' => theme_get_setting('footer_credits','abtik'),
    '#description'   => t("Check this option to show copyright text in footer. Uncheck to hide."),
  );
  
  return $form;
}