<?php
class freeApi{
    private $apiUrl;
    private $appKey;

    public function __construct($appKey){
        $this->appKey = $appKey;
        $this->apiUrl = 'https://apis.map.qq.com/ws/district/v1/search';
    }
    /**
     * 获取结果
     * @return string
     */
    public function getResult(){
        $paras = [
            'key' => $this->appKey,
            'keyword' => '北京市',
        ];
        return $this->freeApiCurl($this->apiUrl,$paras);
    }
    /**
     * 请求接口返回内容
     * @param  string $url [请求的URL地址]
     * @param  string $params [请求的参数]
     * @return  string
     */
    public function freeApiCurl($url,$params=[]){
        if (!$params) return false;
        return file_get_contents($url.'?'.http_build_query($params));
    }
}