The front end uses ajax to send an empty array to the back end, but the back end cannot get the empty array!

The thing is like this, I use ajax to interact with the backend and need to send a bunch of data to the backend. I encapsulated the data and it is in the following format! This is send_data in my ajax function below.

The data is an array of objects. The objects contained in the array have two keys, namely role_code and user_list. Among them, user_list is an array by default and can be empty.

This array has been successfully sent to the backend, but the user_list with a length of 0 cannot be obtained by the backend! Any user_list whose length is not 0 can be obtained by the backend

So I went to the browser to check the request information and found that I didn’t seem to have sent a few empty arrays.

I am very confused, can’t jqeury’s ajax function pass an empty array? Attached is my ajax code, in which send_data is the data I typed out at the beginning.

<code>$.ajax({
    url:"<?php echo site_url('AnnouncementAgent/UserDepartmentConfig/editDepartmentRoleInfo');?>"+"/"+$(this).parents(".modal-content").attr("id"),
    type:"POST",
    data:{send_data},
    dataType:"json",
    success:function (data) {
    if (data.status==1) {
        alert("成功！");
        location.reload();
    }else{
        alert("失败！");
    }                    
   }
})</code>

Please ask God to clarify my doubts!

Reply content:

The thing is like this, I use ajax to interact with the backend and need to send a bunch of data to the backend. I encapsulated the data and it is in the following format! This is send_data in my ajax function below.

The data is an array of objects. The objects contained in the array have two keys, namely role_code and user_list. Among them, user_list is an array by default and can be empty.

This array has been successfully sent to the backend, but the user_list with a length of 0 cannot be obtained by the backend! Any user_list whose length is not 0 can be obtained by the backend

So I went to the browser to check the request information and found that I didn’t seem to have sent a few empty arrays.

I am very confused, can’t jqeury’s ajax function pass an empty array? Attached is my ajax code, in which send_data is the data I typed out at the beginning.

<code>$.ajax({
    url:"<?php echo site_url('AnnouncementAgent/UserDepartmentConfig/editDepartmentRoleInfo');?>"+"/"+$(this).parents(".modal-content").attr("id"),
    type:"POST",
    data:{send_data},
    dataType:"json",
    success:function (data) {
    if (data.status==1) {
        alert("成功！");
        location.reload();
    }else{
        alert("失败！");
    }                    
   }
})</code>

Please ask God to clarify my doubts!

Strictly control the format:
data:JSON.stringify(send_data)

By the way, after the front-end and back-end agree on the format, and the front-end converts it to json encoding, an empty array can be passed (of course, it cannot be called an array after encoding).
Backend (php) json_decode() will do.

One last thing to say, it feels a bit ugly to mix PHP code into the front-end code. . .

name value plus

<code>data:{user_list:send_data},</code>

<code>$.ajax({
        type: "POST",
        url: '',
        dataType:'json',
        data: {
            参数A: 参数A的值,
            参数B: 参数B的值
        },
        success:function(result){
            if (result.success) {
                
            }else{
                
            }
        }
    });</code>