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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 |
---|---|
906 |
|
907 | if ( empty( $text ) ) |
908 | return false; |
909 |
|
910 | $protocol = $_SERVER["SERVER_PROTOCOL"]; |
911 | if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol ) |
912 | $protocol = 'HTTP/1.0'; |
913 | $status_header = "$protocol $header $text"; |
914 | if ( function_exists( 'apply_filters' ) ) |
915 | $status_header = apply_filters( 'status_header', $status_header, $header, $text, $protocol ); |
916 |
|
917 | return @header( $status_header, true, $header ); |
918 | } |
919 |
|
920 | /** |
921 | * Gets the header information to prevent caching. |
922 | * |
923 | * The several different headers cover the different ways cache prevention is handled |
924 | * by different browsers |