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I want to send JSON data (in this case is client timestamp) to my server. However, my code seem doesn't work as I expect.
My idea is using fetch to send FormData (which contain an input has JSON as value) to the PHP. At the server side, PHP will take care the form with $_POST and return JSON string to me.
I'm using a free host service, which has PHP 7.0, for testing stuff.
All of the code below is in the same file (404.php):
var now = new Date();
var pkg = JSON.stringify({
ts: now.getTime(),
tz: now.getTimezoneOffset() / -60
})
var form = new FormData();
form.set('json', pkg);
console.log(form.has('json')) // true
console.log(form.values().next()) // return and obj contain JSON string
fetch('/404.php', {
method: 'POST',
body: form
});
$json = null;
if(isset($_POST['json'])) $json = json_decode($_POST['json']);
var_dump($_POST); //Result: array(0) { }
As you can see, the output of var_dump is an empty array. But what I expect to see is an output with a JSON string.
I've tried another way, which is this one fetch-api-json-php, but it also no use. All the resource I found on the Internet usually about the classic AJAX, not fetch API. And most of them are only for client side, there isn't much I could find for PHP/server side.
Can you try to run this code in your local machine?
Make a file name 55788817.php and paste this code and run.
<?php
if (isset($_POST) && !empty($_POST)) {
$json = null;
if(isset($_POST['json'])) $json = json_decode($_POST['json']);
var_dump($_POST); //Result: array(1) { ["json"]=> string(29) "{"ts":1555915560755,"tz":5.5}" }
exit;
}
?>
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<button type="button" id="registerButton">Click Me!</button>
<script>
var now = new Date();
var pkg = JSON.stringify({
ts: now.getTime(),
tz: now.getTimezoneOffset() / -60
})
var form = new FormData();
form.append('json', pkg);
console.log(form.has('json')) // true
console.log(form.values().next()) // return and obj contain JSON string
fetch('./55788817.php', {
method: 'POST',
body: form
});
</script>
</body>
</html>
133
answered Jun 25 '26 21:06
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