javascript - Passing JS variable to PHP -

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i trying pass js variable php , have php echo js variable back. keep getting empty null string. doing wrong? 

function(u){              if(u){                 var dt = {'ud':u};                 console.log(dt);                  $.post('xrege.php', dt, function(r){                     console.log(r.responsetext);                     console.log(typeof(r.responsetext));                 });             }         });   <?php  $ud = $_post['ud']; echo json_encode($ud); ?>

you should separate php code different file , should working.

if(u){     var dt = {'ud':u};     console.log(dt);      $.post('xrege.php', dt, function(r){         console.log(r);         console.log(typeof r);     },"json"); }

name above code 123.html , keep below code in xrege.php

<?php $ud = $_post['ud']; echo json_encode($ud); ?>

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