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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 |
|---|---|
| 185 | $redirect_url .= $redirect['path']; |
| 186 | if ( $redirect['query'] ) |
| 187 | $redirect_url .= '?' . $redirect['query']; |
| 188 | } |
| 189 | |
| 190 | if ( !$redirect_url || $redirect_url == $requested_url ) |
| 191 | return false; |
| 192 | |
| 193 | // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE |
| 194 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
| 195 | |
| 196 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request |
| 197 | return false; |
| 198 | |
| 199 | if ( $do_redirect ) { |
| 200 | // protect against chained redirects |
| 201 | if ( !redirect_canonical($redirect_url, false) ) { |
| 202 | wp_redirect($redirect_url, 301); |
| 203 | exit(); |