将JSON发布到PHP脚本

Question

I am stuck a long time with trying to send a JSON from javascript to a PHP script : the sending is fine (I can see the JSON in fiddler) yet I receive nothing in the PHP script :

javascript:

var person = {
  name: 'yoel',
  age: 28
};
xmlhttp.open("POST","http://localhost:8888/statisticsdb.php",true);
xmlhttp.setRequestHeader("Content-Type", "application/json");
xmlhttp.send(JSON.stringify(person));   

php :

echo 'trying to print ' . var_dump($_POST["name"]);

I would expect obviously to see SOMETHING but var_dump returns nothing. Help would be much appreciated!

Answer 1

try:

$data = json_decode(file_get_contents('php://input'));
var_dump($data->name);

the reason for this is, that the body of your POST-request is:

{"name":"yoel","age":28}

though, php expects something like (ref):

name=yoel&age=28

The json string can not be parsed properly, and thus $_POST will be empty.