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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 |
|---|---|
| 5986 | * Filters extra file headers by context. |
| 5987 | * |
| 5988 | * The dynamic portion of the hook name, `$context`, refers to |
| 5989 | * the context where extra headers might be loaded. |
| 5990 | * |
| 5991 | * @since 2.9.0 |
| 5992 | * |
| 5993 | * @param array $extra_context_headers Empty array by default. |
| 5994 | */ |
| 5995 | $extra_headers = $context ? apply_filters( "extra_{$context}_headers", array() ) : array(); |
| 5996 | if ( $extra_headers ) { |
| 5997 | $extra_headers = array_combine( $extra_headers, $extra_headers ); // Keys equal values. |
| 5998 | $all_headers = array_merge( $extra_headers, (array) $default_headers ); |
| 5999 | } else { |
| 6000 | $all_headers = $default_headers; |
| 6001 | } |
| 6002 | |
| 6003 | foreach ( $all_headers as $field => $regex ) { |
| 6004 | if ( preg_match( '/^[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] ) { |