Rookie for advice

Use $.ajax to submit,

$.ajax({ type: "POST", url: 'getData.php', async: false, data: $('#guestbook').serialize(), error: function(XMLHttpRequest, textStatus, errorThrown) { alert(XMLHttpRequest.status); alert(XMLHttpRequest.readyState); alert(textStatus); }, success: function(data){ alert(data); } })

The serialized value obtained in the background is in the form ofname1=value1&name2=value2&name3=value3...

$data = file_get_contents("php://input"); $str = urldecode($data);

How to convert the obtained data into an array or json, and the key value corresponds