PUT with PHP and CURL

put_withCurl.php

<?php
// EXAMPLE OF PUT with PHP and CURL
//
// by Keran McKenzie
// 
// NOTE this assumes you are posting JSON  in a variable called $jsonString
// also assumes we have the username & password in variables

// setup Curl
$session = curl_init();

// Put requires a file to 'put' to the servier, so lets use php's TEMP file function 
// to create the file so we don't have to worry about writing a file to the server
$putData = tmpfile();
// now we write the JSON string into the file
fwrite($putData, $jsonString);
// Reset the file pointer
fseek($putData, 0);

// Setup our headers so we tell the server to expect JSON
$headers = array(
        'Accept: application/json',
        'Content-Type: application/json',
    );
curl_setopt($session, CURLOPT_HTTPHEADER, $headers);
// We want to transfer this as a Binary Transfer
curl_setopt($session, CURLOPT_BINARYTRANSFER, true);
curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
// Do you want CURL to output the headers? Set to FALSE to hide them
curl_setopt($session, CURLOPT_HEADER, true); 
// pass the URL to CURL
curl_setopt($session, CURLOPT_URL, $url);
// Tell CURL we are using PUT
curl_setopt($session, CURLOPT_PUT, true);
// Authenticate the user using basic auth $username and $password
curl_setopt($session, CURLOPT_USERPWD,  $username.":".$password );
// Now we want to tell CURL the were the file is and it's size
curl_setopt($session, CURLOPT_INFILE, $putData);
curl_setopt($session, CURLOPT_INFILESIZE, strlen($putString));
// right all done? Lets execute this
$output = curl_exec($session);

// echo the output to the screen
echo $output;

// Clean up by closing the file and closing curl
fclose($putData);
curl_close($session);

Line 39: $putString is undefined. Did you mean $jsonString?