/**
 * Generic REST PHP client (Tested)
 * @see $this->rest_call('https://httpbin.org', '/post', 'POST', array('test' => date('Y-m-d H:i:s')), array(CURLAUTH_DIGEST, 'user', 'pass'), true);
 * @param string $path
 * @param string $method
 * @param array $vars
 * @param array $auth
 * @param boolean $debug
 * @return boolean || string
 */
function rest_call($url, $path = '', $method = 'GET', $vars = array(), $auth = array(), $debug = false) {
    defined('ERROR_LOG') or define('ERROR_LOG', tempnam(sys_get_temp_dir(),'REST'));
    defined('PHP_VERSION_ID') or define('PHP_VERSION_ID', preg_replace('/[^0-9A-Za-z\.]/', '', PHP_VERSION));
 
    if (empty($url)) {
        file_put_contents(ERROR_LOG, "REST call url not set\n", FILE_APPEND);
        return false;
    }
 
    $url .= $path;
    $tmpfile = '';
    $postdata = http_build_query($vars, '', '&');
    if ($method == 'GET' && count($vars) > 0) {
        $url .= '?' . $postdata;
    }
 
    $ch = curl_init($url);
    if ($debug) {
        curl_setopt($ch, CURLOPT_VERBOSE, 1); $fp = fopen(ERROR_LOG, 'w'); curl_setopt($ch, CURLOPT_STDERR, $fp);
    }
 
    switch ($method) {
        case 'GET':
            curl_setopt($ch, CURLOPT_HTTPGET, true);
            break;
        case 'POST':
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
            break;
        case 'PUT':
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
            curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
            file_put_contents($tmpfile = tempnam(sys_get_temp_dir(),'RESTPUT'), $postdata);
            curl_setopt($ch, CURLOPT_INFILE, $fp = fopen($tmpfile, 'r'));
            curl_setopt($ch, CURLOPT_INFILESIZE, filesize($tmpfile));
            break;
        case 'DELETE':
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
            curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
            break;
        default:
            curl_setopt($ch, CURLOPT_HTTPGET, true);
            break;
    }
 
    if (isset($auth[0]) && isset($auth[1]) && isset($auth[2])) {
        switch ($auth[0]) {
            case 'basic':
            case CURLAUTH_BASIC:
                curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
                curl_setopt($ch, CURLOPT_USERPWD, $auth[1].':'.$auth[2]);
                break;
            case 'digest':
            case CURLAUTH_DIGEST:
                curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
                curl_setopt($ch, CURLOPT_USERPWD, $auth[1].':'.$auth[2]);
                break;
            case 'none':
            case CURLAUTH_NONE:
            default:
                curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_NONE);
                break;
        }
    }
 
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; REST PHP caller; PHP/'.PHP_VERSION_ID.')');
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);
    $res = curl_exec($ch);
    $errno = curl_errno($ch); $errmsg = curl_error($ch);
    $http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
 
    if (strlen($tmpfile)) {
        unlink($tmpfile);
    }
 
    if ($debug) {
        fclose($fp);
    }
 
    if ($res === false || $errno != 0) {
        file_put_contents(ERROR_LOG, "REST call error {$errmsg}\n", FILE_APPEND);
        return false;
    }
 
    if ($http_status != 200) {
        file_put_contents(ERROR_LOG, "REST call http status {$http_status}\n", FILE_APPEND);
        return false;
    }
 
    return $res;
}