Node.js服务器和PHP服务器的差异与理论混淆

Question

I have been able to write apps in both node.js and php for a while now, however only really discovered a weird difference that I feel I still do not entirely understand.

The difference I think I have noticed is that assuming we have to clients visiting a web app run by php, they will have two completely difference instances of all data on the backend (variables arrays, etc). Where as in node.js, they don't quite.

Here is a test I did to try and save some confusion:

PHP test

frontend js

$.post("/ajax.php", {test:"test"}, function(result){
    console.log(result);
});

ajax.php

$testarr = array();

if(isset($_POST['test'])){
    $testarr[] = $_POST['test'];
    print_r($testarr);
}

...In this example, if i visit the app in two different browsers, or even in the same client, the frontend console will always output an array with a single element in it. So the array essentially resets on refresh obviously/new request.

Node.js test

frontend js

$.post("/test", {test:"test"}, function(result){
    console.log(result);
});

app.js

var testarr = [];
app.post("/test", function(req, res){
    testarr.push(req.body.test);
    console.log(testarr);
});

Here, however, when i refresh the page even from different browsers, the array does not reset and I end up with ["test", "test", "test", etc] on each request. How can two different clients from two different browsers access the same array like this? usually data has to be shared via a database,special requests, etc right?

I am clearly misunderstanding some big philosophy with node.js and I would appreciate anyone with a nice explanation.

Answer 1

区别在于，PHP为每个请求创建了一个新环境，而node.js没有。

Answer 2

我不是最大的PHP专家，但是我认为您可以覆盖PHP数组，而不是添加新元素。您可以使用array_push（）将某些内容添加到测试人员中。