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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 |
---|---|
282 | * |
283 | * @since 1.0.0 |
284 | * |
285 | * @param string $url Permalink to check. |
286 | * @return int Post ID, or 0 on failure. |
287 | */ |
288 | function url_to_postid($url) { |
289 | global $wp_rewrite; |
290 |
|
291 | $url = apply_filters('url_to_postid', $url); |
292 |
|
293 | // First, check to see if there is a 'p=N' or 'page_id=N' to match against |
294 | if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) ) { |
295 | $id = absint($values[2]); |
296 | if ( $id ) |
297 | return $id; |
298 | } |
299 |
|
300 | // Check to see if we are using rewrite rules |