javascript - How do i make my php variable accessible? -


i trying implement timer. learned idea post. 

<?php    if(($_server['request_method'] === 'post') && !empty($_post['username']))   {     //secondsdiff declared here     $remainingday     = floor($secondsdiff/60/60/24);   } ?>

this php code. php,html , js codes in same page. have button in html. when user clicks on html page, call ajax function

                        //url:"onlinetest.php",                         //datatype: 'json',                         beforesend: function()                         {                             $(".startmytest").off('click');                             setcountdown();                         }

it call setcountdown() method, contains line @ beginning

     var days = <?php echo $remainingday; ?>;

when run page, says[even before clicking button] "expected expression, got '<'" in above line. doubt is

why php variable replaced before triggering button. please let me know hoe solve or how change idea.

the problem is, since initial load, $_post values aren't populated (empty on first load),

that variable set undefined, make sure initialize variable fist.

<?php // initialize $remainingday = 1; if(($_server['request_method'] === 'post') && !empty($_post['username'])) {     //secondsdiff declared here     $remainingday     = floor($secondsdiff/60/60/24);     echo json_encode(array('remaining_day' => $remainingday);     exit; } ?>  <script> var days = <?php echo $remainingday; ?>; $('.your_button').on('click', function(){     $.ajax({         url: 'something.php',         datatype: 'json',         type: 'post',         beforesend: function() {             // whatever processes need         },         success: function(response) {             alert(response.remaining_day);         }     }); }); </script>

that basic idea, added other codes particular example, add/change rest of logic thats needed on side.


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