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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 |
|---|---|
| 354 | /** |
| 355 | * Filters the active theme directory path. |
| 356 | * |
| 357 | * @since 1.5.0 |
| 358 | * |
| 359 | * @param string $template_dir The path of the active theme directory. |
| 360 | * @param string $template Directory name of the active theme. |
| 361 | * @param string $theme_root Absolute path to the themes directory. |
| 362 | */ |
| 363 | $template_dir = apply_filters( 'template_directory', $template_dir, $template, $theme_root ); |
| 364 | |
| 365 | // If there are filter callbacks, force the logic to execute on every call. |
| 366 | if ( has_filter( 'template' ) || has_filter( 'theme_root' ) || has_filter( 'template_directory' ) ) { |
| 367 | return $template_dir; |
| 368 | } |
| 369 | |
| 370 | $wp_template_path = $template_dir; |
| 371 | } |
| 372 | |