Ajax无法向php发送数据使用GET

Question

I create a html, and after I submit, the ajax should send a message to php, but my php doesn't get this data, please tell me how do I do, thank you.

function SendData(){
    $.ajax({
        type: "GET",
        url: "client.php?m=submit",
        success: function(data){
            alert("success");
        },
        error: function(data){
            alert("error");
        }
    });
}

php code always nothing, I know the m isn't exist, but I don't understand.

$message = isset($_GET['m']);
echo $message;

Answer 1

The problem is that you get a boolean with isset();

Do like this:

if(isset($_GET['m'])) {
  $message = $_GET['m'];
  echo $message;
}