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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 |
---|---|
6661 | * Filters extra file headers by context. |
6662 | * |
6663 | * The dynamic portion of the hook name, `$context`, refers to |
6664 | * the context where extra headers might be loaded. |
6665 | * |
6666 | * @since 2.9.0 |
6667 | * |
6668 | * @param array $extra_context_headers Empty array by default. |
6669 | */ |
6670 | $extra_headers = $context ? apply_filters( "extra_{$context}_headers", array() ) : array(); |
6671 | if ( $extra_headers ) { |
6672 | $extra_headers = array_combine( $extra_headers, $extra_headers ); // Keys equal values. |
6673 | $all_headers = array_merge( $extra_headers, (array) $default_headers ); |
6674 | } else { |
6675 | $all_headers = $default_headers; |
6676 | } |
6677 |
|
6678 | foreach ( $all_headers as $field => $regex ) { |
6679 | if ( preg_match( '/^(?:[ \t]*<\?php)?[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] ) { |