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   Contributed by acosmin — 2 years ago

   Set the excerpt length based on a theme mod, through the Customizer.

   prefix_custom_excerpt_length( $length ) {
   	$custom = get_theme_mod( 'custom_excerpt_length' );
   	if( $custom != '' ) {
   		return $length = intval( $custom );
   	} else {
   		return $length;
   	}
   }
   add_filter( 'excerpt_length', 'prefix_custom_excerpt_length', 999 );
   
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   Contributed by Karmegaraja Subramaniam — 1 year ago

   /**
    * Filter the excerpt length to 50 characters.
    *
    * @param int $length Excerpt length.
    * @return int (Maybe) modified excerpt length.
    */
   function theme_slug_excerpt_length( $length ) {
           if ( is_admin() ) {
                   return $length;
           }
           return 50;
   }
   add_filter( 'excerpt_length', 'theme_slug_excerpt_length', 999 );

   This will help to apply the excerpt_length on front end only.
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   Contributed by Metallicarosetail — 2 years ago

   /**
    * Filter the excerpt length to 30 characters.
    *
    * @param int $length Excerpt length.
    * @return int (Maybe) modified excerpt length.
    */
   function wp_example_excerpt_length( $length ) {
       return 30;
   }
   add_filter( 'excerpt_length', 'wp_example_excerpt_length');

   Notes: This will display your excerpt text up to 30 words using excerpt_length filter. By default the number of words is 55.

   Example:-

   <?php the_excerpt(); ?>

   This will display your post excerpt up to 30 words.

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