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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 |
---|---|
1038 | * |
1039 | * @param array $headers { |
1040 | * Header names and field values. |
1041 | * |
1042 | * @type string $Expires Expires header. |
1043 | * @type string $Cache-Control Cache-Control header. |
1044 | * @type string $Pragma Pragma header. |
1045 | * } |
1046 | */ |
1047 | $headers = (array) apply_filters( 'nocache_headers', $headers ); |
1048 | } |
1049 | $headers['Last-Modified'] = false; |
1050 | return $headers; |
1051 | } |
1052 |
|
1053 | /** |
1054 | * Set the headers to prevent caching for the different browsers. |
1055 | * |
1056 | * Different browsers support different nocache headers, so several |