unlink（）无法在PHP中使用AJAX

Question

我在PHP中使用unlink（）时遇到问题... 见代码：

JS：

$(".delete").on("click", function() {
var id = $(this).data("id");
$("#status").text("Deleted");
$.post("adminServer.php", { id: id }, function(data) {
    data = JSON.parse(data);
    alert(data);
});

}）;

PHP：

$id = $_POST['id'];

$sql = "SELECT * FROM `upload_img` WHERE `id` = '$id'";
$result = mysqli_query($db, $sql);
$row = mysqli_fetch_assoc($result);

$target = "/uploads/".$row['image'];

chmod($target, 0777);

unlink($target);

$sql = "DELETE FROM `upload_img` WHERE `id` = '$id'";
$result = mysqli_query($db, $sql);

if ($result == true) {
   $check = "Sucessfully deleted";
} else {
   $check = "Error while deleting";
}

echo json_encode($check);

它没有告诉我错误和图像没有删除...

我不知道为什么这不起作用...请帮忙！

谢谢！