Hide WP version

plugin.php

// hide the meta tag generator from head and rss
function disable_version() {
    return '';
}
add_filter('the_generator','disable_version');
remove_action('wp_head', 'wp_generator');

// hide the meta tag generator from scripts and styles
function remove_version_from_style_js( $src ) {
    if ( strpos( $src, 'ver=' . get_bloginfo( 'version' ) ) )
    $src = remove_query_arg( 'ver', $src );
    return $src;
}
add_filter( 'style_loader_src', 'remove_version_from_style_js');
add_filter( 'script_loader_src', 'remove_version_from_style_js');