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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 |
|---|---|
| 277 | $redirect_url .= $redirect['path']; |
| 278 | if ( !empty($redirect['query']) ) |
| 279 | $redirect_url .= '?' . $redirect['query']; |
| 280 | } |
| 281 | |
| 282 | if ( $redirect_url == $requested_url ) |
| 283 | return false; |
| 284 | |
| 285 | // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE |
| 286 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
| 287 | |
| 288 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request |
| 289 | return false; |
| 290 | |
| 291 | if ( $do_redirect ) { |
| 292 | // protect against chained redirects |
| 293 | if ( !redirect_canonical($redirect_url, false) ) { |
| 294 | wp_redirect($redirect_url, 301); |
| 295 | exit(); |