Sending boolean values with $.ajax to PHP

Question

I post data to a PHP backend using jQuery $.ajax:

$.ajax({
    url: "server.php",
    method: "post",
    data: {
        testVariable: true
    }
});

On the server side I tried die(gettype($_POST["testVariable"])); which returns string.

I'm trying to save the JSON data posted from Javascript to a MySQL database, but boolean values get quoted which is not what should happen.

What gets inserted is {"testVariable": "true"} and what I need is {"testVariable": true}. How do I accomplish this?

This is normal behaviour, you can really only send strings, not booleans, so booleans are converted to strings when posted — adeneo
– adeneo, Commented Nov 16, 2016 at 13:56
on the php side, you can use json_decode php.net/manual/en/function.json-decode.php to parse the incoming data into an array or object. — Loopo
– Loopo, Commented Nov 16, 2016 at 14:01
or just send 1 as true and 0 as false in jor ajax, and convert it in your php to boolean. (boolean true is original an 1 and false a 0 (binary)) — Timon Post
– Timon Post, Commented Nov 16, 2016 at 14:22
Possible duplicate of Bool parameter from jQuery Ajax received as literal string "false"/"true" in PHP — san san
– san san, Commented Nov 16, 2016 at 14:35

rafwell · Accepted Answer · 2016-11-16 14:46:14Z

2

This is the expected behavior. On PHP you need convert the string to boolean, if you need, using a ternary or the method you like. Or you can send 1/0 to represent boolean state.

Converting like that:

$testVariable = ($_POST['testVariable'] === 'true'); //return the boolean evaluation of expression

answered Nov 16, 2016 at 14:46

rafwell

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