http是从别人哪里拷过来的
调用方法：
$longitude='116.31396648653';
$latitude='40.043261357402';
$address=CoordinatetransferAddress($longitude,$latitude);




function CoordinatetransferAddress($longitude,$latitude){


$url ="http://api.map.baidu.com/geoconv/v1/?coords=".$longitude.",".$latitude."&from=1&to=5&ak=WGcKO4YO9ZqyV9EtTtLrOwSd";
$content = http($url, NULL, 'POST', array("Content-type: text/html; charset=utf-8"));
$obj = json_decode($content);
$obj =$obj->result;
$obj = $obj['0'];
$longitude=$obj->x;
$latitude=$obj->y;
$url ="http://api.map.baidu.com/geocoder/v2/?ak=WGcKO4YO9ZqyV9EtTtLrOwSd&callback=renderReverse&location=".$latitude.",".$longitude."&output=json&pois=1";
$content = http($url, NULL, 'POST', array("Content-type: text/html; charset=utf-8"));
$content = substr($content,29);
$content = substr($content,0,-1);
$obj = json_decode($content);
$obj =$obj->result; ;
return $obj->formatted_address;
}


function http($url, $params, $method = 'GET', $header = array(), $multi = false){
$opts = array(
CURLOPT_TIMEOUT => 30,
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_SSL_VERIFYHOST => false,
CURLOPT_HTTPHEADER => $header
);
/* 根据请求类型设置特定参数 */
switch(strtoupper($method)){
case 'GET':
$opts[CURLOPT_URL] = $url . '?' . http_build_query($params);
break;
case 'POST':
//判断是否传输文件
$params = $multi ? $params : http_build_query($params);
$opts[CURLOPT_URL] = $url;
$opts[CURLOPT_POST] = 1;
$opts[CURLOPT_POSTFIELDS] = $params;
break;
default:
throw new Exception('不支持的请求方式！');
}
/* 初始化并执行curl请求 */
$ch = curl_init();
curl_setopt_array($ch, $opts);
$data = curl_exec($ch);
$error = curl_error($ch);
curl_close($ch);
if($error) throw new Exception('请求发生错误：' . $error);
return $data;


}