Through URL pass parameter to php, but php doesn't get it, Why?

Question

I create the table and use ajax to pass data.

This is my ajax part, I put the parameter in URL, but php code doesn't read it.

$.ajax({
        type:"POST",
        url:"system_setting.php?p=add",
        data:"username="+username+"&password="+password+"&nickname="+nickname+"&authority="+authority,
        success:function(data){
            viewData();
        }
    });

I use $page=isset($_GET['p'])?$_GET['p']:''; to judgment parameter, but it doesn't read. Please teach me how should I do, thank you.

Answer 1

Use POST instead and add p=add in data instead url

$.ajax({
    type:"POST",
    url:"system_setting.php",
    data:"p=add&username="+username+"&password="+password+"&nickname="+nickname+"&authority="+authority,
    success:function(data){
        viewData();
    }
});

And in php

$page=isset($_POST['p'])?$_POST['p']:'';

Answer 2

You have to use only POST or only GET. Working example:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
var username="username";
var password="password";
var nickname="nickname";
var authority="authority";


$.ajax({
        type:"POST",
        url:"system_setting.php",
        data:"p=add&username="+username+"&password="+password+"&nickname="+nickname+"&authority="+authority,
        success:function(data){
             alert(data);
        }
    });
</script>

In system_setting.php

$page=isset($_POST['p'])?$_POST['p']:'';

echo $page;

Answer 3

Give this a try:

var data = {};
data.username = username;
data.password = password;
data.nickname = nickname;
data.authority = authority; 
data.p = “add”;
$.ajax({
     type:"POST",
     url:"system_setting.php", 
     data: data
 }).done(function(data){
     viewData();
 });

Then when you need the data uses $_POST[] eg $_POST['p']

Answer 4

Try this,ajax parameter "method" is used for POST and GET.

    $.ajax({
        method: "POST",
        url: "system_setting.php",
        data: { p:"add", username: "unsername", password: "password", nickname:  "nickname", authority:"authority" },
        success:function(data){
            alert(data);
        }
    });