PHP - Moved: Ajax Not Sending To Php Help

Hi,

I am trying to send input Don't, can't or anything else which contains '. But Ajax sends it like: t_name=Don%27t&_=1589636831048 and then I got an error while trying to insert to mysql. I only have problem with '. I tried lots of thing but something is missing. I couldn't figure it out. Could somebody help me?

My Ajax:

var t_name = document.getElementById(mydiv).value;
$.ajax(
            {
                type: "GET",
                url: './api/objects/add.php',
                async:false,
                cache:false,
                contentType: "application/x-www-form-urlencoded;charset=ISO-8859-1",
                dataType: 'json',
                data: {
                    t_tsk: id,
                    t_name: t_name
                },
                success: function (result) {
                    
                },
                error: function(xhr, status, error) {
                    document.getElementById("errorDiv").hidden = false;
                	if (xhr.responseText) {
                		
                	} else {
                        
                    }
                }
            });

 My url when I write don't to input area: /add.php?t_tsk=1&t_name=Don%27t&_=1589636831048

My php code:

<?php
    // include database and object files
    include_once '../config/database.php';
    include_once '../objects/myObject.php';
     
    // get database connection
    $database = new Database();
    $db = $database->getConnection();
    
        $myObject = new MyObject($db);
        $myObject->t_id = isset($_GET['t_tsk']) ? $_GET['t_tsk'] : die();
        $myObject->name = isset($_GET['t_name']) ? utf8_decode($_GET['t_name']) : die();
        
        if($myObject->create()){
            http_response_code(200);
            $myObject_arr=array(
                "status" => true,
                "message" => "Successfully created!",
                "id" => $myObject->id,
                "name" => $myObject->name
            );
        }
        else{
            http_response_code(401);
            $myObject_arr=array(
                "status" => false,
                "message" => "Error!"
            );
        }
    print_r(json_encode($myObject_arr));
?>

Thank you all.