excerpt_length

The excerpt_length filter allows you to set the length of the excerpt.

Examples

If you want remove excerpt on category pages:

add_filter( 'excerpt_length','lh_custom_category_excerpt_length', 1000 );
function lh_custom_category_excerpt_length( $length ) 
{
    if ( is_category() ) {
        return 0;
    } 
    return $length;
}

Usage

Please refer to the Using Filters article to learn how to use this filter.