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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 |
---|---|
1111 | * @see wp_get_nocache_headers() |
1112 | * |
1113 | * @param array $headers { |
1114 | * Header names and field values. |
1115 | * |
1116 | * @type string $Expires Expires header. |
1117 | * @type string $Cache-Control Cache-Control header. |
1118 | * } |
1119 | */ |
1120 | $headers = (array) apply_filters( 'nocache_headers', $headers ); |
1121 | } |
1122 | $headers['Last-Modified'] = false; |
1123 | return $headers; |
1124 | } |
1125 |
|
1126 | /** |
1127 | * Set the headers to prevent caching for the different browsers. |
1128 | * |
1129 | * Different browsers support different nocache headers, so several |