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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 |
|---|---|
| 1475 | * @see wp_get_nocache_headers() |
| 1476 | * |
| 1477 | * @param array $headers { |
| 1478 | * Header names and field values. |
| 1479 | * |
| 1480 | * @type string $Expires Expires header. |
| 1481 | * @type string $Cache-Control Cache-Control header. |
| 1482 | * } |
| 1483 | */ |
| 1484 | $headers = (array) apply_filters( 'nocache_headers', $headers ); |
| 1485 | } |
| 1486 | $headers['Last-Modified'] = false; |
| 1487 | return $headers; |
| 1488 | } |
| 1489 | |
| 1490 | /** |
| 1491 | * Set the headers to prevent caching for the different browsers. |
| 1492 | * |
| 1493 | * Different browsers support different nocache headers, so several |