I want save javascript variable data in php variable

I want to save javascript variable data in the PHP variable. here is the example that I am doing:-

   var res = "success";
       echo ?> document.write('res') <?php;

in this code, I am getting an error. please give me some solution to this problem.

Read more here: https://stackoverflow.com/questions/64943115/i-want-save-javascript-variable-data-in-php-variable

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