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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 |
---|---|
940 | * Filter an HTTP status header. |
941 | * |
942 | * @since 2.2.0 |
943 | * |
944 | * @param string $status_header HTTP status header. |
945 | * @param int $code HTTP status code. |
946 | * @param string $description Description for the status code. |
947 | * @param string $protocol Server protocol. |
948 | */ |
949 | $status_header = apply_filters( 'status_header', $status_header, $code, $description, $protocol ); |
950 |
|
951 | @header( $status_header, true, $code ); |
952 | } |
953 |
|
954 | /** |
955 | * Gets the header information to prevent caching. |
956 | * |
957 | * The several different headers cover the different ways cache prevention is handled |
958 | * by different browsers |