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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 |
|---|---|
| 1510 | if ( empty( $file ) ) { |
| 1511 | $path = $stylesheet_directory; |
| 1512 | } elseif ( file_exists( $stylesheet_directory . '/' . $file ) ) { |
| 1513 | $path = $stylesheet_directory . '/' . $file; |
| 1514 | } else { |
| 1515 | $path = $template_directory . '/' . $file; |
| 1516 | } |
| 1517 | |
| 1518 | /** This filter is documented in wp-includes/link-template.php */ |
| 1519 | return apply_filters( 'theme_file_path', $path, $file ); |
| 1520 | } |
| 1521 | |
| 1522 | /** |
| 1523 | * Determines the latest WordPress default theme that is installed. |
| 1524 | * |
| 1525 | * This hits the filesystem. |
| 1526 | * |
| 1527 | * @since 4.4.0 |
| 1528 | * |