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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 |
---|---|
217 | * |
218 | * @since 1.0.0 |
219 | * |
220 | * @param string $url Permalink to check. |
221 | * @return int Post ID, or 0 on failure. |
222 | */ |
223 | function url_to_postid($url) { |
224 | global $wp_rewrite; |
225 |
|
226 | $url = apply_filters('url_to_postid', $url); |
227 |
|
228 | // First, check to see if there is a 'p=N' or 'page_id=N' to match against |
229 | if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) ) { |
230 | $id = absint($values[2]); |
231 | if ($id) |
232 | return $id; |
233 | } |
234 |
|
235 | // Check to see if we are using rewrite rules |