How do you change the theme location?

2 comments

1. You can register additional directory or directories with themes by using register_theme_directory() function, that accepts filesystem path to folder.

   Note that this isn’t typical and even while core handles it mostly fine, third party code in themes and plugins might not.

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2. You have to change the path and the URL to make sure themes work. I am using the following MU-Plugin in one of my local setups:

   <?php
   /* Plugin Name: Local Theme Roots */
   
   if ( 'single.wp' === $_SERVER['HTTP_HOST'] )
       return;
   
   add_filter( 'theme_root_uri', 't5_switch_theme_root' );
   add_filter( 'theme_root',     't5_switch_theme_root' );
   
   /**
    * Create a custom theme directory.
    *
    * @wp-hook theme_root
    * @wp-hook theme_root_uri
    * @author  Thomas Scholz, http://toscho.de
    * @param   string $in URL or path
    * @return  string
    */
   function t5_switch_theme_root( $in )
   {
       // local multi-sites end with 'mu.wp'. Example: t5.mu.wp.
       if ( 0 !== stripos( strrev( $_SERVER['HTTP_HOST'] ), 'pw.um' ) )
       {
           return $in;
       }
   
   
       if ( 'theme_root_uri' === current_filter() )
       {
           return "http://themes.wp";
       }
   
       // If we made it so far we are in the 'theme_root' filter.
       $new_root = dirname( dirname( __DIR__ ) ) . '/wp-themes';
       register_theme_directory( $new_root );
       return $new_root;
   }
   

   Be aware automatic theme upgrades will not work now due to a bug in the upgrader. I have fixed that and submitted a patch, but until 3.6 comes out you have to run upgrades separately.

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