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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 |
|---|---|
| 350 | if ( !function_exists('lowercase_octets') ) { |
| 351 | function lowercase_octets($matches) { |
| 352 | return strtolower( $matches[0] ); |
| 353 | } |
| 354 | } |
| 355 | $requested_url = preg_replace_callback('|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url); |
| 356 | } |
| 357 | |
| 358 | // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE |
| 359 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
| 360 | |
| 361 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request |
| 362 | return false; |
| 363 | |
| 364 | if ( $do_redirect ) { |
| 365 | // protect against chained redirects |
| 366 | if ( !redirect_canonical($redirect_url, false) ) { |
| 367 | wp_redirect($redirect_url, 301); |
| 368 | exit(); |