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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 |
|---|---|
| 220 | * |
| 221 | * @since 1.0.0 |
| 222 | * |
| 223 | * @param string $url Permalink to check. |
| 224 | * @return int Post ID, or 0 on failure. |
| 225 | */ |
| 226 | function url_to_postid($url) { |
| 227 | global $wp_rewrite; |
| 228 | |
| 229 | $url = apply_filters('url_to_postid', $url); |
| 230 | |
| 231 | // First, check to see if there is a 'p=N' or 'page_id=N' to match against |
| 232 | if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) ) { |
| 233 | $id = absint($values[2]); |
| 234 | if ($id) |
| 235 | return $id; |
| 236 | } |
| 237 | |
| 238 | // Check to see if we are using rewrite rules |