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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 |
|---|---|
| 1503 | /** |
| 1504 | * Filters the cache-controlling HTTP headers that are used to prevent caching. |
| 1505 | * |
| 1506 | * @since 2.8.0 |
| 1507 | * |
| 1508 | * @see wp_get_nocache_headers() |
| 1509 | * |
| 1510 | * @param array $headers Header names and field values. |
| 1511 | */ |
| 1512 | $headers = (array) apply_filters( 'nocache_headers', $headers ); |
| 1513 | } |
| 1514 | $headers['Last-Modified'] = false; |
| 1515 | return $headers; |
| 1516 | } |
| 1517 | |
| 1518 | /** |
| 1519 | * Sets the HTTP headers to prevent caching for the different browsers. |
| 1520 | * |
| 1521 | * Different browsers support different nocache headers, so several |