Add Yoast Meta

add_yoast_meta.php

<?php

function add_to_yoast_seo($post_id, $metatitle, $metadesc, $metakeywords){
  $ret = false;
  // Include plugin library to check if Yoast Seo is presently active
  include_once( ABSPATH.'panel/includes/plugin.php' );

  if(is_plugin_active(ABSPATH.'wp-content/plugins/wordpress-seo/wp-seo.php')) {
      //plugin is activated
      $updated_title = update_post_meta($post_id, '_yoast_wpseo_title', $metatitle);
      $updated_desc = update_post_meta($post_id, '_yoast_wpseo_metadesc', $metadesc);
      $updated_kw = update_post_meta($post_id, '_yoast_wpseo_metakeywords', $metakeywords);

      if($updated_title && $updated_desc && $updated_kw){
          $ret = true;
      }
  }

  return $ret;
}

?>