WordPress at a glance
filter is not described

wp_trim_excerpt filter-hook . WP 2.8.0

Filters the trimmed excerpt string.

Usage

add_filter( 'wp_trim_excerpt', 'filter_function_name_378', 10, 2 );
function filter_function_name_378( $text, $raw_excerpt ){
	// filter...

	return $text;
}
$text(string)
The trimmed text.
$raw_excerpt(string)
The text prior to trimming.

Where the hook is called

wp_trim_excerpt()
wp-includes/formatting.php 3343
return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt );

Where the hook is used (in WP core)

Does not used.