title: Save data of custom metabox in Wordpress
body: <p>I added a meta-box to the edit link page &amp; I can't save the data whatever I put in the field. How can I only update the meta-box without saving the data in the database? Here is my code:</p>
  
  <pre><code>// backwards compatible
  add_action( 'admin_init', 'blc_add_custom_link_box', 1 ); 
  
  /* Do something with the data entered */
  add_action( 'save_link', 'blc_save_linkdata' );
  
  /* Adds a box to the main column on the Post and Page edit screens */
  function blc_add_custom_link_box() {
      add_meta_box( 
          'backlinkdiv',
          'Backlink URL',
          'blc_backlink_url_input',
          'link',
          'normal',
          'high'
      );
  }
  
  /* Prints the box content */
  function blc_backlink_url_input( $post ) {
    // Use nonce for verification
    wp_nonce_field( plugin_basename( __FILE__ ), 'blc_noncename' );
  
    // The actual fields for data entry
    echo '&lt;input type="text" id="backlink-url" name="backlink_url" value="put your backlink here" size="60" /&gt;';
  
    #echo "&lt;p&gt; _e('Example: &lt;code&gt;http://Example.org/Linkpage&lt;/code&gt; &amp;#8212; don&amp;#8217;t forget the &lt;code&gt;http://&lt;/code&gt;')&lt;/p&gt;";
  }
  </code></pre>
  
  <p>How can I save or update the data of the input field of metabox? Only the data should be updated in the metabox. It should not save in database by any type of custom field.</p>