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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 |
|---|---|
| 873 | |
| 874 | if ( empty( $text ) ) |
| 875 | return false; |
| 876 | |
| 877 | $protocol = $_SERVER["SERVER_PROTOCOL"]; |
| 878 | if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol ) |
| 879 | $protocol = 'HTTP/1.0'; |
| 880 | $status_header = "$protocol $header $text"; |
| 881 | if ( function_exists( 'apply_filters' ) ) |
| 882 | $status_header = apply_filters( 'status_header', $status_header, $header, $text, $protocol ); |
| 883 | |
| 884 | return @header( $status_header, true, $header ); |
| 885 | } |
| 886 | |
| 887 | /** |
| 888 | * Gets the header information to prevent caching. |
| 889 | * |
| 890 | * The several different headers cover the different ways cache prevention is handled |
| 891 | * by different browsers |