apply_filters( ‘excerpt_length’, int $number )

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   Karmegaraja Subramaniam 8 years ago

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   wp-includes/formatting.php

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   /**
    * Filter the excerpt length to 50 words.
    *
    * @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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   acosmin 8 years ago

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

   wp-includes/formatting.php

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   function prefix_custom_excerpt_length( $length ) {
   	$custom = get_theme_mod( 'custom_excerpt_length' );
   
   	if ( '' !== $custom ) {
   		return absint( $custom );
   	} else {
   		return $length;
   	}
   }
   add_filter( 'excerpt_length', 'prefix_custom_excerpt_length', 999 );

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   prashaddey 7 years ago

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   wp-includes/formatting.php

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   /**
    * Filter the excerpt length to 20 words.
    *
    * @param int $length Excerpt length.
    * @return int (Maybe) modified excerpt length.
    */
   add_filter( 'excerpt_length', function( $length ) { return 20; } );

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   • It’s important to set the priority to a high number so your callback is not overwritten by the WordPress default callback.

     leogermani 6 years ago
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   Metallicarosetail 8 years ago

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   wp-includes/formatting.php

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   /**
    * Filter the excerpt length to 30 words.
    *
    * @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:-

   wp-includes/formatting.php

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   <?php the_excerpt(); ?>

   This will display your post excerpt up to 30 words.

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   Deepak Rajpal 5 years ago

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   wp-includes/formatting.php

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   /**
    * Filter the excerpt length to 80 words on homepage and 50 words on page template
    *
    * @param int $length Excerpt length.
    * @return int modified excerpt length.
    */
   function wpdocs_custom_excerpt_length( $length ) {
       if ( is_page_template( 'page-templates/services-page.php' ) ) {
           return 50;
       } else if ( is_front_page() && is_home() ) {
           return 80;
       } else {
           return $length;
       }
   }
   
   add_filter( 'excerpt_length', 'wpdocs_custom_excerpt_length', 999 );

   This is useful to display different excerpt length on homepage, custom page template (where listing some custom post types).

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