Change excerpt lenght between tag, category and home

Hi there,

Something like that should do it:

add_filter( 'excerpt_length', function( $length ) {
    // Category archives.
    if ( is_category() ) {
        return 0;
    }

    // Tag archives.
    if ( is_tag() ) {
        return 5;
    }

    // Homepage blog.
    if ( is_home() ) {
        return 10;
    }

    return $length;
}, 1000 );

Let me know ??

Perfect, thank you.

It works with the parent theme but not a child thème.

Adding it to the parent theme means you’ll lose it when you update. There shouldn’t be a difference between child and parent theme when it comes to code execution.