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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 |
|---|---|
| 1557 | if ( empty( $file ) ) { |
| 1558 | $path = $stylesheet_directory; |
| 1559 | } elseif ( file_exists( $stylesheet_directory . '/' . $file ) ) { |
| 1560 | $path = $stylesheet_directory . '/' . $file; |
| 1561 | } else { |
| 1562 | $path = $template_directory . '/' . $file; |
| 1563 | } |
| 1564 | |
| 1565 | /** This filter is documented in wp-includes/link-template.php */ |
| 1566 | return apply_filters( 'theme_file_path', $path, $file ); |
| 1567 | } |
| 1568 | |
| 1569 | /** |
| 1570 | * Determines the latest WordPress default theme that is installed. |
| 1571 | * |
| 1572 | * This hits the filesystem. |
| 1573 | * |
| 1574 | * @since 4.4.0 |
| 1575 | * |