将值从jquery变量传递给php变量

I need to get id from table row by clicking on that row and use that id in another php file. For this I was getting id by jquery, the code is

var id = $(this).closest("tr").find('td:eq(0)').text(); // it's working

And I want to pass this id as php variable. But any one isn't work. My code is:

$(document).ready(function(){
  $("#people-table tr").click(function(){
    var id = $(this).closest("tr").find('td:eq(0)').text();
     $.ajax({
        url: "default_people.php",
        type: "GET",

        data: { id1: id},
        success: function (result) {
                alert(id);
        }
    });
  });
});

And my php code is:

  $a = $_GET['id1'];
  echo $a ;

Try jquery $.get :

$(document).ready(function(){
  $("#people-table tr").click(function(){
    var id = $(this).closest("tr").find('td:eq(0)').text();
     $.get("default_people.php?id="+id);
  });
});

Your selector is already a tr element:

var id = $(this).find('td:eq(0)').text(); // use this

so you don't have to traverse up to the tr* with .closest(), you can remove it.

and in the success function you are using a wrong argument:

success: function (result) {
     alert(result); // <-------update to this
}

and at php end you can use isset() method:

if(isset($_GET['id'])){
  $a = $_GET['id1'];
  echo $a ;
}

_{* depends on your dom structrue actually.}