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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 |
|---|---|
| 71 | $base = preg_replace( '|^/index\.php/|', '/', $base ); |
| 72 | return $base; |
| 73 | } |
| 74 | |
| 75 | // examine a url (supposedly from this blog) and try to |
| 76 | // determine the post ID it represents. |
| 77 | function url_to_postid($url) { |
| 78 | global $wp_rewrite; |
| 79 | |
| 80 | $url = apply_filters('url_to_postid', $url); |
| 81 | |
| 82 | // First, check to see if there is a 'p=N' or 'page_id=N' to match against |
| 83 | if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) ) { |
| 84 | $id = absint($values[2]); |
| 85 | if ($id) |
| 86 | return $id; |
| 87 | } |
| 88 | |
| 89 | // Check to see if we are using rewrite rules |