PHP使用Redis的GEO(地理位置)指令

Redis自3.2版本開始新增對GEO(地理位置)的支持，但是地球不是一個完美的球體，在最壞的情況下的偏差可能是0.5%。接近兩極的區域是不支持的，支持坐標的有效的經度從-180度到180度；有效的緯度從-85.05112878度到85.05112878度，超出範圍將會報錯。

我喜歡爬山，學習GEO的時候我也以山的座標做演示，我的座標是：

116.517159,39.922267

我整理了一些山的座標

$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.向mountainCoordinates的key裡增加座標

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();
}

執行結果

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

2.取得座標

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();
}

執行結果

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.計算兩個座標間距離

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();
}

執行結果：海陀山和小五台山之間距離是94.4219km

string(7) "94.4219"

4.以我的座標為原點，以半徑100km取座標（找出離我100公里以內的山）

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();
}

執行結果：只有海陀山，離我95.8884km

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

5.以我的座標為原點，以半徑1500km取座標（找出離我1500公里以內的山）

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();
}

執行結果：找出了5座山

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.以小五台山的座標為原點，按半徑1000km取座標（找出離小五台山1000公里以內的山）

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();
}

執行結果：排除小五台自己，找到了鰲山和海陀山

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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