arc-hive-wordpress-theme/library/excerpt-mods.php

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<?php
/**
* Filter the except length to 20 words.
*
* @param int $length Excerpt length.
* @return int (Maybe) modified excerpt length.
*/
if ( ! function_exists( 'foundationpress_custom_excerpt_length' ) ) :
function foundationpress_custom_excerpt_length( $length ) {
return 20;
}
add_filter( 'excerpt_length', 'foundationpress_custom_excerpt_length', 999 );
endif;