Code to Change the Excerpt Length in WordPress

/* Change Excerpt Length WordPress */
function wpflt_change_excerpt_length( $length ) {
    return 30;
}
add_filter( 'excerpt_length', wpflt_change_excerpt_length');

The default WordPress Excerpt length is 55 words. If you want to change the number of words, excerpt displays. In the above code replace 30 with your custom number.

You can also use the Filter below to change the excerpt length.

/* Change Excerpt Length WordPress */
add_filter( 'excerpt_length', function( $length ) { return 30; } );