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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 |
|---|---|
| 4016 | * Filter extra file headers by context. |
| 4017 | * |
| 4018 | * The dynamic portion of the hook name, $context, refers to the context |
| 4019 | * where extra headers might be loaded. |
| 4020 | * |
| 4021 | * @since 2.9.0 |
| 4022 | * |
| 4023 | * @param array $extra_context_headers Empty array by default. |
| 4024 | */ |
| 4025 | if ( $context && $extra_headers = apply_filters( "extra_{$context}_headers", array() ) ) { |
| 4026 | $extra_headers = array_combine( $extra_headers, $extra_headers ); // keys equal values |
| 4027 | $all_headers = array_merge( $extra_headers, (array) $default_headers ); |
| 4028 | } else { |
| 4029 | $all_headers = $default_headers; |
| 4030 | } |
| 4031 | |
| 4032 | foreach ( $all_headers as $field => $regex ) { |
| 4033 | if ( preg_match( '/^[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] ) |
| 4034 | $all_headers[ $field ] = _cleanup_header_comment( $match[1] ); |