Send a boolean value in jQuery ajax data - php

Question

I'm sending some data in an Ajax call. One of the values is a boolean set to FALSE. It is always evaluated as TRUE in the PHP script called by the Ajax. Any ideas?
$.ajax({
type: "POST",
data: {photo_id: photo_id,
vote: 1,
undo_vote: false}, // This is the important boolean!
url: "../../build/ajaxes/vote.php",
success: function(data){
console.log(data);
}
});
In vote.php, the script that is called in the above Ajax, I check the boolean value:
if ($_POST['undo_vote'] == true) {
Photo::undo_vote($_POST['photo_id']);
} else {
Photo::vote($_POST['photo_id'], $_POST['vote']);
}
But the $_POST['undo_vote'] == true condition is ALWAYS met.

Answer 1

A post is just text, and text will evaluate as true in php. A quick fix would be to send a zero instead of false. You could also put quotes around your true in PHP.
if ($_POST['undo_vote'] == "true") {
Photo::undo_vote($_POST['photo_id']);
} else {
Photo::vote($_POST['photo_id'], $_POST['vote']);
}
Then you can pass in true/false text. If that's what you prefer.

Answer 2

You can use JSON.stringify() to send request data:
data : JSON.stringify(json)
and decode it on server:
$data = json_decode($_POST);

Answer 3

You can use 0 and 1 for undo_vote and type cast it in php:
JS side:
undo_vote: 0 // false
Server side:
$undovote = (bool) $_POST['undo_vote']; // now you have Boolean true / false
if($undovote) {
// True, do something
} else {
// False, do something else
}