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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 |
|---|---|
| 463 | global $wp_rewrite; |
| 464 | |
| 465 | /** |
| 466 | * Filter the URL to derive the post ID from. |
| 467 | * |
| 468 | * @since 2.2.0 |
| 469 | * |
| 470 | * @param string $url The URL to derive the post ID from. |
| 471 | */ |
| 472 | $url = apply_filters( 'url_to_postid', $url ); |
| 473 | |
| 474 | // First, check to see if there is a 'p=N' or 'page_id=N' to match against |
| 475 | if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) ) { |
| 476 | $id = absint($values[2]); |
| 477 | if ( $id ) |
| 478 | return $id; |
| 479 | } |
| 480 | |
| 481 | // Get rid of the #anchor |