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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 |
|---|---|
| 5474 | * Filters extra file headers by context. |
| 5475 | * |
| 5476 | * The dynamic portion of the hook name, `$context`, refers to |
| 5477 | * the context where extra headers might be loaded. |
| 5478 | * |
| 5479 | * @since 2.9.0 |
| 5480 | * |
| 5481 | * @param array $extra_context_headers Empty array by default. |
| 5482 | */ |
| 5483 | if ( $context && $extra_headers = apply_filters( "extra_{$context}_headers", array() ) ) { |
| 5484 | $extra_headers = array_combine( $extra_headers, $extra_headers ); // keys equal values |
| 5485 | $all_headers = array_merge( $extra_headers, (array) $default_headers ); |
| 5486 | } else { |
| 5487 | $all_headers = $default_headers; |
| 5488 | } |
| 5489 | |
| 5490 | foreach ( $all_headers as $field => $regex ) { |
| 5491 | if ( preg_match( '/^[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] ) { |
| 5492 | $all_headers[ $field ] = _cleanup_header_comment( $match[1] ); |