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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 |
---|---|
796 |
|
797 | if ( empty( $text ) ) |
798 | return false; |
799 |
|
800 | $protocol = $_SERVER["SERVER_PROTOCOL"]; |
801 | if ( ('HTTP/1.1' != $protocol) && ('HTTP/1.0' != $protocol) ) |
802 | $protocol = 'HTTP/1.0'; |
803 | $status_header = "$protocol $header $text"; |
804 | if ( function_exists('apply_filters') ) |
805 | $status_header = apply_filters('status_header', $status_header, $header, $text, $protocol); |
806 |
|
807 | if ( version_compare( phpversion(), '4.3.0', '>=' ) ) { |
808 | return @header( $status_header, true, $header ); |
809 | } else { |
810 | return @header( $status_header ); |
811 | } |
812 | } |
813 |
|
814 | function nocache_headers() { |