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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 |
|---|---|
| 439 | |
| 440 | /** |
| 441 | * Filter the HTTP headers before they're sent to the browser. |
| 442 | * |
| 443 | * @since 2.8.0 |
| 444 | * |
| 445 | * @param array $headers The list of headers to be sent. |
| 446 | * @param WP $this Current WordPress environment instance. |
| 447 | */ |
| 448 | $headers = apply_filters( 'wp_headers', $headers, $this ); |
| 449 | |
| 450 | if ( ! empty( $status ) ) |
| 451 | status_header( $status ); |
| 452 | |
| 453 | // If Last-Modified is set to false, it should not be sent (no-cache situation). |
| 454 | if ( isset( $headers['Last-Modified'] ) && false === $headers['Last-Modified'] ) { |
| 455 | unset( $headers['Last-Modified'] ); |
| 456 | |
| 457 | // In PHP 5.3+, make sure we are not sending a Last-Modified header. |