Drupal: Set content in a region programmatically

<?php
/**
 * @file
 * 
 * Provide an administrator interface for adding SEO text & images for specific page
 * 
 * DrupalD <DrupalD@twitter>
 */



/**
 * Implementation of hook_menu
 * 
 * DrupalD <DrupalD@twitter>
 */
function seo_util_menu() {
    $item['admin/config/development/seo-util'] = array(
        'type' => MENU_NORMAL_ITEM,
        'title' => t('SEO text'),
      'page callback' => 'seo_util_overview',
      'access arguments' => array('Administer site configuration')
    );
    
    $item['admin/config/development/seo-util/manage'] = array(
        'type' => MENU_DEFAULT_LOCAL_TASK,
        'title' => t('Manage text'),
      'page callback' => 'seo_util_overview',
      'access arguments' => array('Administer site configuration'),
      'weight' => -10,
    );    
    
    
    $item['admin/config/development/seo-util/config'] = array(
    'type' => MENU_LOCAL_TASK,
    'title' => t('Settings'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('seo_util_config'),
    'access arguments' => array('Administer site configuration'),
      'weight' => -7,
  );
    
    return $item;
}

/**
 * seo_util_overview
 * 
 * Display SEO text overview
 * 
 * DrupalD <DrupalD@twitter>
 */
function seo_util_overview() {
    drupal_add_css(drupal_get_path('module', 'seo_util') .'/seo_util.css');
    $am__overview = drupal_get_form('seo_util_global_text');
    $output = '<div class="global">'. drupal_render($am__overview);
  $output .= '<div class="summary">'. _get_config_summary() .'</div>';  
    return $output;
    
}


/**
 * seo_util_global_text
 * 
 * DrupalD <DrupalD@twitter>
 */
function seo_util_global_text() {
    $form['global_text'] = array(
    '#type' => 'textarea',
    '#title' => t('Global text'),
    '#description' => t('Set the text for all pages. This will be overwritten 
      by the individual page text. You can use PHP code within @php. 
      You will need to enable PHP filter module to do this.', 
      array('@php' => '<?php 
?>

')),
'#default_value' => variable_get('global_text', ''),
'#weight' => -50,
);

return system_settings_form($form);
}

/**
* seo_util_config
*
* Select the vocabulary for which text to be added
*
* DrupalD
*/
function seo_util_config() {
$am__vocabulary = taxonomy_vocabulary_get_names();
$am__vocab = array();
$am__vocab[0] = t('-- Select --');
foreach ($am__vocabulary as $vocabulary => $ob) {
$am__vocab[$ob->vid] = $ob->name;
}

$form['seo_util_province_vocabulary'] = array(
'#type' => 'select',
'#title' => t('Province Vocabulary'),
'#description' => t('Select a vocabulary which provides a list of
provice & cities'),
'#options' => $am__vocab,
'#required' => TRUE,
'#default_value' => variable_get('seo_util_province_vocabulary',00),
'#weight' => -10,
);

$form['seo_util_course_vocabulary'] = array(
'#type' => 'select',
'#title' => t('Course Vocabulary'),
'#description' => t('Select a vocabulary which provides a list of courses'),
'#options' => $am__vocab,
'#required' => TRUE,
'#default_value' => variable_get('seo_util_course_vocabulary',00),
'#weight' => -9,
);

$form['seo_util_theme_regions'] = array(
'#type' => 'select',
'#title' => t('Theme regions'),
'#description' => t('Select the region where you want to display the
text for each of the pages/path') .'
'.
t('The regions are listed from your default theme. Your default
theme is @theme.', array('@theme' => variable_get('theme_default', ''))),
'#options' => system_region_list(variable_get('theme_default', '')),
'#required' => TRUE,
'#default_value' => variable_get('seo_util_theme_regions', ''),
);

return system_settings_form($form);
}

/**
* Implementation of hook_page_build
*
* @param $page
* DrupalD
*/
function seo_util_page_build(&$page) {
$ss__global_text = variable_get('global_text', '');
$ss__region = variable_get('seo_util_theme_regions', '');
$page[$ss__region]['text']['#markup'] = php_eval($ss__global_text);
}

/**
* _get_config_summary
*
* DrupalD
*/
function _get_config_summary() {
$output = '

'. t('Configuration summary') .'

';

$output .= '

';
$output .= '
• '. t('Province/City taxonomy')
  .': '. _get_vocabulary(variable_get('seo_util_province_vocabulary', '--')) .'

';
$output .= '

• '. t('Course taxonomy')
  .': '. _get_vocabulary(variable_get('seo_util_course_vocabulary', '--')) .'

';
$output .= '

• '. t('Default theme region') .': '.
  variable_get('seo_util_theme_regions', '--') .'

';
$output .= '

• '. t('Default theme') .': '.
  variable_get('theme_default', '--') .'

';
$output .= '

';
$output .= t('You can change above configuration from !config page',
array('!config' => l(t('Settings'), 'admin/config/development/seo-util/config')));
return $output;
}

/**
* _get_vocabulary
*
* Enter description here ...
* @param unknown_type $sn__vid
* DrupalD
*/
function _get_vocabulary($sn__vid) {
$names = db_query('SELECT name FROM {taxonomy_vocabulary} WHERE vid = :vid',
array(':vid' => $sn__vid))->fetchAllAssoc('name');
$names = array_values($names);

return $names[0]->name;
}
?>