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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 |
---|---|
413 | if ( !function_exists('lowercase_octets') ) { |
414 | function lowercase_octets($matches) { |
415 | return strtolower( $matches[0] ); |
416 | } |
417 | } |
418 | $requested_url = preg_replace_callback('|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url); |
419 | } |
420 |
|
421 | // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning false |
422 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
423 |
|
424 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request |
425 | return false; |
426 |
|
427 | if ( $do_redirect ) { |
428 | // protect against chained redirects |
429 | if ( !redirect_canonical($redirect_url, false) ) { |
430 | wp_redirect($redirect_url, 301); |
431 | exit(); |