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   Contributed by SpartakusMd — 3 years ago

   Filter page templates by blog id

   Suppose you have the blog `Food` with the id 2 and the template `page-food.php` which should only be used for this blog. The example below removes the page template from dropdowns of other blogs:

   /**
    * Filter the theme page templates.
    *
    * @param array    $page_templates Page templates.
    * @param WP_Theme $this           WP_Theme instance.
    * @param WP_Post  $post           The post being edited, provided for context, or null.
    * @return array (Maybe) modified page templates array.
    */
   function wpdocs_filter_theme_page_templates( $page_templates, $this, $post ) {
   	$current_blog_id = get_current_blog_id();
   	$food_blog_id    = 2;
   
   	if ( $current_blog_id != $food_blog_id ) {
   		if ( isset( $page_templates['page-food.php'] ) ) {
   			unset( $page_templates['page-food.php'] );
   		}
   	}
   	return $page_templates;
   }
   add_filter( 'theme_page_templates', 'wpdocs_filter_theme_page_templates', 20, 3 );
   

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