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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 |
|---|---|
| 339 | $redirect_url .= $redirect['path']; |
| 340 | if ( !empty($redirect['query']) ) |
| 341 | $redirect_url .= '?' . $redirect['query']; |
| 342 | } |
| 343 | |
| 344 | if ( !$redirect_url || $redirect_url == $requested_url ) |
| 345 | return false; |
| 346 | |
| 347 | // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE |
| 348 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
| 349 | |
| 350 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request |
| 351 | return false; |
| 352 | |
| 353 | if ( $do_redirect ) { |
| 354 | // protect against chained redirects |
| 355 | if ( !redirect_canonical($redirect_url, false) ) { |
| 356 | wp_redirect($redirect_url, 301); |
| 357 | exit(); |