调用天气接口

1--准备url
$url="http://apis.juhe.cn/simpleWeather/query?city=$city&key=c3cafa68a2eebb7892d44e21fd656f07";
$city查询的城市地址，需用urlencode("$city")改变格式。key为聚合数据申请的key码
2--发送url需要用下面的函数，可放进公共函数内使用，返回的是json格式的字符串可用json_decode(juheHttpRequest($url))转成对象
/**

• 发起网络请求函数
• @param $url 请求的URL
• @param bool $params 请求的参数内容
• @param int $ispost 是否POST请求
• @return bool|string 返回内容
  */

function juheHttpRequest($url, $params = false, $ispost = 0)
{
    $httpInfo = array();
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36');
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
    curl_setopt($ch, CURLOPT_TIMEOUT, 12);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    if ($ispost) {
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
        curl_setopt($ch, CURLOPT_URL, $url);
    } else {
        if ($params) {
            curl_setopt($ch, CURLOPT_URL, $url.'?'.$params);
        } else {
            curl_setopt($ch, CURLOPT_URL, $url);
        }
    }
    $response = curl_exec($ch);
    if ($response === FALSE) {
        // echo "cURL Error: ".curl_error($ch);
        return false;
    }
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $httpInfo = array_merge($httpInfo, curl_getinfo($ch));
    curl_close($ch);
    return $response;
}