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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 |
|---|---|
| 505 | |
| 506 | /** |
| 507 | * Filters the HTTP headers before they're sent to the browser. |
| 508 | * |
| 509 | * @since 2.8.0 |
| 510 | * |
| 511 | * @param string[] $headers Associative array of headers to be sent. |
| 512 | * @param WP $wp Current WordPress environment instance. |
| 513 | */ |
| 514 | $headers = apply_filters( 'wp_headers', $headers, $this ); |
| 515 | |
| 516 | if ( ! empty( $status ) ) { |
| 517 | status_header( $status ); |
| 518 | } |
| 519 | |
| 520 | // If Last-Modified is set to false, it should not be sent (no-cache situation). |
| 521 | if ( isset( $headers['Last-Modified'] ) && false === $headers['Last-Modified'] ) { |
| 522 | unset( $headers['Last-Modified'] ); |
| 523 | |