So I am trying to do this in javascript:

let testAgain = [{
        "test": JSON.stringify(otherArray), 
        "a" : 'test'
        }];

req.send(JSON.stringify(testAgain));

and then I am trying:

<?php
$servername = "oatney.cauldron.dreamhost.com";
$username = "Me";
$password = "MyPassword";
$dbname = "MyDb";

$conn = new mysqli($servername, $username, $password, $dbname); // Create connection
if ($conn->connect_error) {     // Check connection
die("Connection failed: " . $conn->connect_error);
} 

$data = mysqli_real_escape_string($conn,file_get_contents('php://input'));

$bob = json_decode(file_get_contents('php://input'), true);//$_POST['test'];

echo "DERP: " .  (file_get_contents('php://input')->$a) . "DERP: " .  (file_get_contents('php://input')->$test) . " || Test: " . ($bob->$test) . " || Test: " . $bob['a'] ;

$sql = "INSERT INTO `niohTwo_cb` (`buildInfo`) VALUES ('$bob')";

if ($conn->query($sql) === TRUE) {
 $last_id = $conn->insert_id;
  echo $last_id;  
} else {
//echo "Error: " . $sql . "<br>" . $conn->error;
}

?>

but for some reason I can't get property "a" or property "test" to appear..