wp_deregister_script('jquery') not working

Question

I use this code:

if ( ! function_exists( 'WPScripts_enqueue' ) ) {
    function WPScripts_enqueue() {

        // Removing default jQuery
        wp_deregister_script( 'jquery' );

        // Enqueue the new jQuery
        wp_enqueue_script('jquery', 'https://code.jquery.com/jquery-3.2.1.slim.min.js', false, '3.2.1', false);

        // Enqueue custom Bootstrap file
        wp_enqueue_style('bootstrap', get_template_directory_uri() . '/css/bootstrap.css', array(), false, 'all');

    }
}
add_action('wp_enqueue_scripts', 'WPScripts_enqueue');

however, wp still load jquery from wp core:

https://developers.google.com/speed/pagespeed/insights/?hl=TR&url=http%3A%2F%2Fwww.migrate2.deniz-tasarim.site%2Fhomepage%2F&tab=desktop

https://i.ibb.co/qxhCY6R/image.png

Answer 1

Use the Following sequence to override jquery
Install latest jQuery version 3.4.1. Update the following sequence of code and try!!!!

      wp_deregister_script('jquery');
      wp_register_script('jquery',("https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"), 
   false);
      wp_enqueue_script('jquery');

I hope it will help you!!!

Answer 2

Add priority to add_action.

add_action('wp_enqueue_scripts', 'WPScripts_enqueue', 999);

Or

add_action('wp_enqueue_scripts', 'WPScripts_enqueue', -1);

Answer 3

Second documentation example (https://developer.wordpress.org/reference/functions/wp_dequeue_script/), use hook wp_print_scripts with priority 100. Like this:

function wpdocs_dequeue_script() {
    wp_dequeue_script( 'jquery-ui-core' );
}

add_action( 'wp_print_scripts', 'wpdocs_dequeue_script', 100 );

Answer 4

You have to first dequeue the script first & then deregister the script as given as bellow

           wp_dequeue_script( 'jquery');

           wp_deregister_script(‘jquery’);

Try this!!