[api][check update]

<?php
/* SIMPLE API FOR, CHECK UPDATE OF APPLICATION */
/* coded by Z0NK3X */
header("content-type:application/json; charset=utf-8");
if(isset($_GET['version'])){
    if (empty($_GET['version'])){
        echo json_encode(["error" => true, "msg" => "version could't empty!"]);
    }
    elseif($_GET['version'] == "1.0"){
        echo json_encode(["error" => false, "update" => "yes", "msg" => "update is available"]);
    }
    elseif($_GET['version'] == "2.0"){
        echo json_encode(["error" => false, "update" => "no", "msg" => "you are using latest version!"]);
    }
    else{
        echo json_encode(["error" => true, "update" => "no", "msg" => "update is unavailable"]);
    }
}
else{
    echo json_encode(["error" => true, "msg" => "invalid operation"]);
}
?>