php - Why AJAX is passing null / empty value? -


hi guys need on issue. managed input value modal form, when try check response show null/empty value.

how can solve this, research on other related questions still cannot solved. attached screenshot + code

here ajax code :

$(function() { $('#tag-form-submit').on('click', function(e) {     var d3_ca = $('#mymodal').find("textarea[name='d3_ca']").val();     console.log(d3_ca);     e.preventdefault();     $.ajax({         type: "post",         url: "d3handler.php",         data: {d3_ca:d3_ca},         success: function(response) {               $('#mymodal').find("textarea[name='d3_ca']").val('');               $('#test').html(response);               $(".modal").modal('hide');         },         error: function() {             alert('error');}     });     return false; }); });

here php code :

if(isset($_post['d3_ca'])) {     $t = $_post['d3_ca'];     echo $t;     if($t === 'aaa')     {         echo 'yes correct value same';     }     else     {         echo 'value not same';     } } else if ($_post['d3_ca'] == '')  {     echo 'get empty value ajax'; }

here code


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