PHP uses Redis's GEO (geographic location) command

Redis has added support for GEO (geographic location) since version 3.2, but the earth is not a perfect sphere, and the deviation may be 0.5% in the worst case. Areas close to the poles are not supported. The valid longitude of supported coordinates is from -180 degrees to 180 degrees; the valid latitude is from -85.05112878 degrees to 85.05112878 degrees. If it exceeds the range, an error will be reported.

I like to climb mountains. When I was learning GEO, I also used the coordinates of mountains to demonstrate. My coordinates are:

116.517159,39.922267

I compiled some mountain coordinates Coordinates

$mountainCoordinates = array(
    array('115.793844', '40.584459', 'Hai_tuo'),//海陀山坐标
    array('115.056232', '39.948933', 'Small_wutai'),//小五台山坐标
    array('114.173822', '27.474563', 'Wu_gong'),//武功山坐标
    array('111.341648', '25.518178', 'Leek_ridge'),//韭菜岭坐标
    array('103.901761', '31.60487', 'Jiu_ding'),//九顶山坐标
    array('107.398009', '34.057777', 'Ao_Shan'),//鳌山坐标
);

1. Add coordinates to the key of mountainCoordinates

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    foreach ($mountainCoordinates as $coordinates){
        $param = array('geoadd', 'mountainCoordinates');
        $param = array_merge($param, $coordinates);
        $ret = call_user_func_array(array($redis, 'rawCommand'), $param);
        print_r($ret);
    }
} catch (Exception $e){
    echo $e->getMessage();
}

Execution results

int(1)
int(1)
int(1)
int(1)
int(1)
int(1)

2. Get coordinates

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    $param = array('geopos', 'mountainCoordinates', 'Hai_tuo', 'Wu_gong', 'Jiu_ding');
    $ret = call_user_func_array(array($redis, 'rawCommand'), $param);
    print_r($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

Execution result

Array
(
    [0] => Array
        (
            [0] => 115.79384654760360718
            [1] => 40.58445845049069334
        )
    [1] => Array
        (
            [0] => 114.1738244891166687
            [1] => 27.47456377424472151
        )
    [2] => Array
        (
            [0] => 103.90176326036453247
            [1] => 31.60486909089710394
        )
)

3. Calculate the distance between two coordinates

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    $param = array('geodist', 'mountainCoordinates', 'Hai_tuo', 'Small_wutai', 'km');
    $ret = call_user_func_array(array($redis, 'rawCommand'), $param);
    var_dump($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

Execution result: The distance between Haituo Mountain and Xiaowutai Mountain is 94.4219km

string(7) "94.4219"

4. Take my coordinates as the origin and get the coordinates according to the radius of 100km (find the mountains within 100 kilometers from me)

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    $param = array('georadius', 'mountainCoordinates', '116.517159', '39.922267', '100', 'km', 'WITHDIST', 'WITHCOORD');
    $ret = call_user_func_array(array($redis, 'rawCommand'), $param);
    print_r($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

Execution result: only the sea Tuoshan, 95.8884km away from me

Array
(
    [0] => Array
        (
            [0] => Hai_tuo
            [1] => 95.8884
            [2] => Array
                (
                    [0] => 115.79384654760360718
                    [1] => 40.58445845049069334
                )
        )
)

5. Take my coordinates as the origin and take the coordinates according to the radius of 1500km (find the mountains within 1500 kilometers from me)

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    $param = array('georadius', 'mountainCoordinates', '116.517159', '39.922267', '1500', 'km', 'WITHDIST', 'WITHCOORD');
    $ret = call_user_func_array(array($redis, 'rawCommand'), $param);
    print_r($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

Execution result: 5 mountains found

Array
(
    [0] => Array
        (
            [0] => Jiu_ding
            [1] => 1464.4350
            [2] => Array
                (
                    [0] => 103.90176326036453247
                    [1] => 31.60486909089710394
                )
        )
    [1] => Array
        (
            [0] => Ao_Shan
            [1] => 1039.1217
            [2] => Array
                (
                    [0] => 107.3980066180229187
                    [1] => 34.05777705537607147
                )
        )
    [2] => Array
        (
            [0] => Wu_gong
            [1] => 1401.2353
            [2] => Array
                (
                    [0] => 114.1738244891166687
                    [1] => 27.47456377424472151
                )
        )
    [3] => Array
        (
            [0] => Small_wutai
            [1] => 124.6283
            [2] => Array
                (
                    [0] => 115.05623370409011841
                    [1] => 39.94893288365195616
                )
        )
    [4] => Array
        (
            [0] => Hai_tuo
            [1] => 95.8884
            [2] => Array
                (
                    [0] => 115.79384654760360718
                    [1] => 40.58445845049069334
                )
        )
)

6. Take the coordinates of Xiaowutai Mountain as the origin, and take the coordinates according to a radius of 1000km (find the mountains within 1000 kilometers from Xiaowutai Mountain)

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    $param = array('georadiusbymember', 'mountainCoordinates', 'Small_wutai', '1000', 'km', 'WITHDIST', 'WITHCOORD');
    $ret = call_user_func_array(array($redis, 'rawCommand'), $param);
    print_r($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

Execution result: Excluding Xiaowutai itself, Aoshan and Haituo Mountain were found

Array
(
    [0] => Array
        (
            [0] => Small_wutai
            [1] => 0.0000
            [2] => Array
                (
                    [0] => 115.05623370409011841
                    [1] => 39.94893288365195616
                )
        )
    [1] => Array
        (
            [0] => Hai_tuo
            [1] => 94.4219
            [2] => Array
                (
                    [0] => 115.79384654760360718
                    [1] => 40.58445845049069334
                )
        )
    [2] => Array
        (
            [0] => Ao_Shan
            [1] => 943.7873
            [2] => Array
                (
                    [0] => 107.3980066180229187
                    [1] => 34.05777705537607147
                )
        )
)

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