PHP - Twitter API -使用空格时请求损坏

<?php
$consumerKey = "Your_Consumer_Key";
$consumerSecret = "Your_Consumer_Secret";
$accessToken = "Your_Access_Token";
$accessTokenSecret = "Your_Access_Token_Secret";

$url = "https://api.twitter.com/1.1/statuses/update.json";
$status = "Hello, Twitter!";

$requestMethod = "POST";
$postFields = array(
    "status" => $status
);

$oauth = array(
    "oauth_consumer_key" => $consumerKey,
    "oauth_nonce" => time(),
    "oauth_signature_method" => "HMAC-SHA1",
    "oauth_timestamp" => time(),
    "oauth_token" => $accessToken,
    "oauth_version" => "1.0"
);

$baseInfo = buildBaseString($url, $requestMethod, array_merge($oauth, $postFields));
$compositeKey = rawurlencode($consumerSecret) . "&" . rawurlencode($accessTokenSecret);
$oauthSignature = base64_encode(hash_hmac("sha1", $baseInfo, $compositeKey, true));
$oauth["oauth_signature"] = $oauthSignature;

$header = array(
    buildAuthorizationHeader($oauth),
    "Content-Type: application/x-www-form-urlencoded"
);

$options = array(
    CURLOPT_HTTPHEADER => $header,
    CURLOPT_POSTFIELDS => http_build_query($postFields),
    CURLOPT_HEADER => false,
    CURLOPT_URL => $url,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_SSL_VERIFYPEER => false
);

$ch = curl_init();
curl_setopt_array($ch, $options);
$response = curl_exec($ch);
curl_close($ch);

echo $response;

function buildBaseString($baseURI, $method, $params) {
    $r = array();
    ksort($params);
    foreach ($params as $key => $value) {
        $r[] = "$key=" . rawurlencode($value);
    }
    return $method . "&" . rawurlencode($baseURI) . "&" . rawurlencode(implode("&", $r));
}

function buildAuthorizationHeader($oauth) {
    $r = "Authorization: OAuth ";
    $values = array();
    foreach ($oauth as $key => $value) {
        $values[] = "$key=\"" . rawurlencode($value) . "\"";
    }
    $r .= implode(", ", $values);
    return $r;
}
?>