嵌套数组通过ajax传递给php

Question

我的网站具有以下菜单结构。我正试图通过它nested arrays'传递parent array值。我的ajax代码传递嵌套和非嵌套数组，但问题是！ 非嵌套数组包含其他嵌套值。例如：以下Views/Art没有嵌套数组，但我的ajax代码将News嵌套元素的值作为常见值传递。如何传递每个数组的嵌套数组而不影响其他数组？

<li>
<input type="checkbox" name="menu[]" value="2">News
    <ul>
        <li>
        <input type="checkbox" name="menu[][menusub]" value="2">Politics
        </li>
        <li>
        <input type="checkbox" name="menu[][menusub]" value="3">Social
        </li>
        <li>
        <input type="checkbox" name="menu[][menusub]" value="4">Economy
        </li>
    </ul>
</li>
<li>
<input type="checkbox" name="menu[]" value="12">Views                                 
</li>
<li>
<input type="checkbox" name="menu[]" value="13">ART                               
</li>

<form enctype="multipart/form-data" id="form">
  ......

</form>

的Ajax

$(document).on('submit', '#form', function(e){
    e.preventDefault();
    var navid = [];
        $("input[name='menu[]']:checked").each(function(){
            navid.push(this.value);
        });
    var subnavid = [];
        $("input[name='menu[][menusub][]']:checked").each(function(){
            subnavid.push(this.value);
        });
    if (navid.length === 0){ //tell you if the array is empty
        alert("Please Select atleast one checkbox");
        return false;
    }
    else {
        var formData = new FormData(this);
        formData.append('navid', navid);
        formData.append('subnavid', subnavid);
            $.ajax({
                type: 'POST',
                url: 'upload.php',
                data: formData,
                contentType: false,
                cache: false,
                processData:false,
                success: function(data){
                    alert(data);
                }
            });
    }
});

PHP

$data = explode("," ,$_POST["navid"]); 
subdata = explode("," ,$_POST["subnavid"]);
foreach ($data AS $key => $menu){
   foreach($subdata AS $k => $submenu){
   ......
   ......
   }
}