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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 |
|---|---|
| 903 | |
| 904 | if ( empty( $description ) ) |
| 905 | return; |
| 906 | |
| 907 | $protocol = $_SERVER['SERVER_PROTOCOL']; |
| 908 | if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol ) |
| 909 | $protocol = 'HTTP/1.0'; |
| 910 | $status_header = "$protocol $code $description"; |
| 911 | if ( function_exists( 'apply_filters' ) ) |
| 912 | $status_header = apply_filters( 'status_header', $status_header, $code, $description, $protocol ); |
| 913 | |
| 914 | @header( $status_header, true, $code ); |
| 915 | } |
| 916 | |
| 917 | /** |
| 918 | * Gets the header information to prevent caching. |
| 919 | * |
| 920 | * The several different headers cover the different ways cache prevention is handled |
| 921 | * by different browsers |