How PHP gets the user's City

 For example, on a page of the wechat Mall , Want to get the city of wechat users , So as to screen out some contents of this city .

2, First, we need to get the client ip Address ( Note that it is not a server ), Don't talk much , Post code

function getClientIP()
{
    
if (isset($_SERVER)) {
    
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    
$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
/*  take X-Forwarded-For The first one is not unknown Effective IP character string  */
foreach ($arr AS $ip) {
    
$ip = trim($ip);
if ($ip != 'unknown') {
    
$realip = $ip;
break;
}
}
if(!isset($realip)){
    
$realip = "0.0.0.0";
}
} elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
    
$realip = $_SERVER['HTTP_CLIENT_IP'];
} else {
    
if (isset($_SERVER['REMOTE_ADDR'])) {
    
$realip = $_SERVER['REMOTE_ADDR'];
} else {
    
$realip = '0.0.0.0';
}
}
} else {
    
if (getenv('HTTP_X_FORWARDED_FOR')) {
    
$realip = getenv('HTTP_X_FORWARDED_FOR');
} elseif (getenv('HTTP_CLIENT_IP')) {
    
$realip = getenv('HTTP_CLIENT_IP');
} else {
    
$realip = getenv('REMOTE_ADDR');
}
}
preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
$realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';
return $realip;
}

3, Then we can ip Get the address of the user's city , The code is as follows ：

// Get the city 
public function getCity()
{
    
//  Get the city where the current location is located 
$getIp = $this->getClientIP();
$content = file_get_contents("http://api.map.baidu.com/location/ip?ak=2TGbi6zzFm5rjYKqPPomh9GBwcgLW5sS&ip={
      $getIp}&coor=bd09ll");
$json = json_decode($content);
$address = $json->{
    'content'}->{
    'address'};// Extraction by hierarchy address data 
$data['address'] = $address;
$return['province'] = mb_substr($data['address'],0,3,'utf-8');
$return['city'] = mb_substr($data['address'],3,3,'utf-8');
return $return;
}

4, Successfully obtained the user's city ($return{[}^{\prime }provinc{e}^{\prime }]byprovinceShare,$return[‘city’] For the city )

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Link to the original text ：https://blog.csdn.net/qq_33210743/article/details/78251936