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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 |
|---|---|
| 288 | global $wp_rewrite; |
| 289 | |
| 290 | /** |
| 291 | * Filter the URL to derive the post ID from. |
| 292 | * |
| 293 | * @since 2.2.0 |
| 294 | * |
| 295 | * @param string $url The URL to derive the post ID from. |
| 296 | */ |
| 297 | $url = apply_filters( 'url_to_postid', $url ); |
| 298 | |
| 299 | // First, check to see if there is a 'p=N' or 'page_id=N' to match against |
| 300 | if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) ) { |
| 301 | $id = absint($values[2]); |
| 302 | if ( $id ) |
| 303 | return $id; |
| 304 | } |
| 305 | |
| 306 | // Check to see if we are using rewrite rules |