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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 660 | if ( $stylesheet_or_template ) { |
| 661 | if ( $theme_root = get_raw_theme_root($stylesheet_or_template) ) |
| 662 | $theme_root = WP_CONTENT_DIR . $theme_root; |
| 663 | else |
| 664 | $theme_root = WP_CONTENT_DIR . '/themes'; |
| 665 | } else { |
| 666 | $theme_root = WP_CONTENT_DIR . '/themes'; |
| 667 | } |
| 668 | |
| 669 | return apply_filters( 'theme_root', $theme_root ); |
| 670 | } |
| 671 | |
| 672 | /** |
| 673 | * Retrieve URI for themes directory. |
| 674 | * |
| 675 | * Does not have trailing slash. |
| 676 | * |
| 677 | * @since 1.5.0 |
| 678 | * |