PHP 调用 新浪API 生成短网址

<?php
// title: 生成新浪短网址
// update: 2018-05-23
// author: iami233
header('Access-Control-Allow-Origin:*');
header('Content-type: application/json');

// 设置常量
define('SINA_APPKEY', '1335371408');

$url = $_GET['url'] ?? null;
if (!$url) {
    sendResponse(201, 'URL参数错误');
    exit;
}

$url = filterUrl($url);
if (!$url) {
    sendResponse(201, '过滤后的URL无效');
    exit;
}

$short = sinaShortenUrl($url);
if (!$short) {
    sendResponse(201, '无法获取短网址');
    exit;
}

$long = sinaExpandUrl($short);
sendResponse(200, '成功', ['short' => $short, 'long' => $long]);

function curlQuery($url, $headers = ["Content-type: application/json"]) {
    $curl = curl_init();
    curl_setopt_array($curl, [
        CURLOPT_URL => $url,
        CURLOPT_HTTPHEADER => $headers,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HEADER => false,
        CURLOPT_TIMEOUT => 15
    ]);
    $result = curl_exec($curl);
    curl_close($curl);
    return $result;
}

function filterUrl($url) {
    $url = trim(strtolower($url));
    if (strpos($url, 'http://') !== 0 && strpos($url, 'https://') !== 0) {
        $url = 'http://' . $url;
    }
    return urlencode($url);
}

function sinaShortenUrl($url) {
    $requestUrl = 'http://api.t.sina.com.cn/short_url/shorten.json?source=' . SINA_APPKEY . '&url_long=' . $url;
    $result = curlQuery($requestUrl);
    $json = json_decode($result, true);
    return $json[0]['url_short'] ?? false;
}

function sinaExpandUrl($url) {
    $requestUrl = 'http://api.t.sina.com.cn/short_url/expand.json?source=' . SINA_APPKEY . '&url_short=' . $url;
    $result = curlQuery($requestUrl);
    $json = json_decode($result, true);
    return $json[0]['url_long'] ?? false;
}

function sendResponse($code, $msg, $data = null) {
    echo json_encode([
        'code' => $code,
        'msg' => $msg,
        'data' => $data
    ], JSON_PRETTY_PRINT|JSON_UNESCAPED_UNICODE);
    exit;
}