PHP 手机号判断归属地

<?php
$mobile = "150********";  //要查询的电话号码
$content = get_mobile_area($mobile);
print_r($content);

function get_mobile_area($mobile){
$sms = array('province'=>'', 'supplier'=>'');    //初始化变量
//根据淘宝的数据库调用返回值
$url = "http://tcc.taobao.com/cc/json/mobile_tel_segment.htm?tel=".$mobile."&t=".time();

$content = file_get_contents($url);
$sms['province'] = substr($content, "56", "4");  //截取字符串
$sms['supplier'] = substr($content, "81", "4");
return $sms;
}