How to add meta tags programmatically to custom pages in Drupal

Meta tags are used for page description, ever wondered on how to add meta tags for the custom pages in Drupal 7. Using hook_html_head_alter() or using hook_preprocess_html() we could add Meta tags and title.

Sample code for adding meta tag description in a page use anyone of the below code in MYTHEME/template.php.

function MYTHEME_html_head_alter(&$head_elements) {
  $head_elements['metatag_description'] = array(
      '#theme' => 'metatag',
      '#tag' => 'meta',
      '#id' => 'metatag_description',
      '#name' => 'description',
      '#value' => 'Description for meta-tags',
      '#type' => 'html_tag',
    );
}

Or you can use the folowing code for achieving the same goal

function MYTHEME_preprocess_html(&$vars) {
  $metatag_description = array(
      '#type' => 'html_tag',
      '#tag' => 'meta',
      '#attributes' => array(
        'name' => 'description',
        'content' => 'Description for meta-tags',
      )
    );
    drupal_add_html_head($metatag_description, 'description');
}