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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 |
|---|---|
| 489 | global $wp_rewrite; |
| 490 | |
| 491 | /** |
| 492 | * Filters the URL to derive the post ID from. |
| 493 | * |
| 494 | * @since 2.2.0 |
| 495 | * |
| 496 | * @param string $url The URL to derive the post ID from. |
| 497 | */ |
| 498 | $url = apply_filters( 'url_to_postid', $url ); |
| 499 | |
| 500 | $url_host = str_replace( 'www.', '', parse_url( $url, PHP_URL_HOST ) ); |
| 501 | $home_url_host = str_replace( 'www.', '', parse_url( home_url(), PHP_URL_HOST ) ); |
| 502 | |
| 503 | // Bail early if the URL does not belong to this site. |
| 504 | if ( $url_host && $url_host !== $home_url_host ) { |
| 505 | return 0; |
| 506 | } |
| 507 | |