Google jquery loading

thanks – ok

in the meanwhile a lot of other big players do offer such things. for example: CDN itself : https://cdnjs.com/

if ;) i would now take that code here:

if( !is_admin()){ 
    $url = 'https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js'; 
    $test_url = @fopen($url,'r'); 
    if($test_url !== false) { 
        function load_external_jQuery() {
            wp_deregister_script('jquery'); 
            wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js'); 
            wp_enqueue_script('jquery'); 
        }
        add_action('wp_enqueue_scripts', 'load_external_jQuery'); 
    } else {
        function load_local_jQuery() {
            wp_deregister_script('jquery'); 
            wp_register_script('jquery', '/wp-includes/js/jquery/jquery.js', __FILE__, false, '1.12.4', true); 
            wp_enqueue_script('jquery'); 
        }
    add_action('wp_enqueue_scripts', 'load_local_jQuery'); 
    }
}

hm but it seems to be not the way – and performace advantages are less than supposed to be.

the wordpress embedded jquery runs in “no conflict” mode – so if you like to rund from a cdn it must be under the same conditions.
How i could obtain that – will be my next study

yes i know – so thats why the code above is with same version as WordPress used now.
And if its not on the cdn the embedded is loaded. (f.e. if your offline)
And maybe if it was an exotic js file this will be an accelleration effort but with wordpress jquerry the amount of millions of installations will garantee that on personal machine there is in the cache the same js file.