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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 |
---|---|
662 | if ( $stylesheet_or_template ) { |
663 | if ( $theme_root = get_raw_theme_root($stylesheet_or_template) ) |
664 | $theme_root = WP_CONTENT_DIR . $theme_root; |
665 | else |
666 | $theme_root = WP_CONTENT_DIR . '/themes'; |
667 | } else { |
668 | $theme_root = WP_CONTENT_DIR . '/themes'; |
669 | } |
670 |
|
671 | return apply_filters( 'theme_root', $theme_root ); |
672 | } |
673 |
|
674 | /** |
675 | * Retrieve URI for themes directory. |
676 | * |
677 | * Does not have trailing slash. |
678 | * |
679 | * @since 1.5.0 |
680 | * |