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