Add Option Tree Metabox to Specific Page Template Only

Add Option Tree Metabox to Specific Page Template Only

$post_id = $_GET['post'] ? $_GET['post'] : $_POST['post_ID'];
$template_file = get_post_meta($post_id, '_wp_page_template', TRUE);

if ($template_file == 'welcome.php') {
    ot_register_meta_box( $home_page_meta_box );
}



/* -------------------------------------------------------------
so, entire file should looks like this: 
------------------------------------------------------------- */


<?php
/**
 * Initialize the meta boxes. 
 */
add_action( 'admin_init', '_custom_meta_boxes' );

/**
 * Meta Boxes demo code.
 *
 * You can find all the available option types
 * in demo-theme-options.php.
 *
 * @return    void
 *
 * @access    private
 * @since     2.0
 */
function _custom_meta_boxes() {
  
  /**
   * Create a custom meta boxes array that we pass to 
   * the OptionTree Meta Box API Class.
   */

    $header_image = array(
    'id'          => 'header_overlay_content',
    'title'       => 'Header Content',
    'pages'       => array( 'page'),
    'context'     => 'normal',
    'priority'    => 'high',
    'fields'      => array(
      array(
        'label'       => 'Header Area',
        'id'          => 'header_content_overlay',
        'type'        => 'textarea',
      )
    )
  );
  
  /**
   * Register our meta boxes using the 
   * ot_register_meta_box() function.
   */
  ot_register_meta_box( $header_image );
  
  $home_page_meta_box = array(
    'id'          => 'home_setting',
    'title'       => 'Home Page Content',
    'desc'        => '',
	'pages'       => array( 'page' ),
    'context'     => 'normal',
    'fields'      => array(
      array(
        'label'       => 'Location',
        'id'          => 'location',
        'type'        => 'text',
        'desc'        => '',
        'std'         => '',
        'rows'        => '',
        'post_type'   => '',
        'taxonomy'    => '',
        'class'       => ''
      ),
      array(
        'label'       => 'Registration Link',
        'id'          => 'register_link',
        'type'        => 'text',
        'desc'        => '',
        'std'         => '',
        'rows'        => '',
        'post_type'   => '',
        'taxonomy'    => '',
        'class'       => ''
      ),
      array(
        'label'       => 'Banner Image Link',
        'id'          => 'banner_img',
        'type'        => 'upload',
        'desc'        => '',
        'std'         => '',
        'rows'        => '',
        'post_type'   => '',
        'taxonomy'    => '',
        'class'       => ''
      ),
	  array(
        'label'       => 'Left Column Content',
        'id'          => 'left_c',
        'type'        => 'textarea',
        'desc'        => '',
        'std'         => '',
        'rows'        => '',
        'post_type'   => '',
        'taxonomy'    => '',
        'class'       => ''
      ),
	  array(
        'label'       => 'Center Column Content',
        'id'          => 'center_c',
        'type'        => 'textarea',
        'desc'        => '',
        'std'         => '',
        'rows'        => '',
        'post_type'   => '',
        'taxonomy'    => '',
        'class'       => ''
      ),
	  array(
        'label'       => 'Right Column Content',
        'id'          => 'right_c',
        'type'        => 'textarea',
        'desc'        => '',
        'std'         => '',
        'rows'        => '',
        'post_type'   => '',
        'taxonomy'    => '',
        'class'       => ''
      )
    )
  );
  
$post_id = $_GET['post'] ? $_GET['post'] : $_POST['post_ID'];
$template_file = get_post_meta($post_id, '_wp_page_template', TRUE);

if ($template_file == 'welcome.php') {
    ot_register_meta_box( $home_page_meta_box );
}

}

Very often we need to use custom meta boxes to our custom page template to add some extra info to your site. If you are using option tree for your theme options, how will you set a variety of meta boxes only to your theme specific template page? Here is an excellent solution to that.

what is this

Isn't this code gives error in dashboard on debug mode?
at least that's what happening to me.