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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 |
|---|---|
| 472 | |
| 473 | /** |
| 474 | * Filters the HTTP headers before they're sent to the browser. |
| 475 | * |
| 476 | * @since 2.8.0 |
| 477 | * |
| 478 | * @param array $headers The list of headers to be sent. |
| 479 | * @param WP $this Current WordPress environment instance. |
| 480 | */ |
| 481 | $headers = apply_filters( 'wp_headers', $headers, $this ); |
| 482 | |
| 483 | if ( ! empty( $status ) ) |
| 484 | status_header( $status ); |
| 485 | |
| 486 | // If Last-Modified is set to false, it should not be sent (no-cache situation). |
| 487 | if ( isset( $headers['Last-Modified'] ) && false === $headers['Last-Modified'] ) { |
| 488 | unset( $headers['Last-Modified'] ); |
| 489 | |
| 490 | // In PHP 5.3+, make sure we are not sending a Last-Modified header. |