Redis自3.2版本开始新增对GEO(地理位置)的支持，但是地球不是一个完美的球体，在最坏的情况下的偏差可能是0.5%。接近两极的区域是不支持的，支持坐标的有效的经度从-180度到180度；有效的纬度从-85.05112878度到85.05112878度，超出范围将会报错。

我喜欢爬山，学习GEO的时候我也以山的坐标做演示，我的坐标是：

116.517159,39.922267

我整理了一些山的坐标

$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里增加坐标

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();}

执行结果

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

2.获取坐标

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();}

执行结果

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.计算两个坐标间距离

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();}

执行结果：海陀山和小五台山之间距离是94.4219km

string(7) "94.4219"

4.以我的坐标为原点，按半径100km取坐标（找出离我100公里以内的山）

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();}

执行结果：只有海陀山，离我95.8884km

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

5.以我的坐标为原点，按半径1500km取坐标（找出离我1500公里以内的山）

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();}

执行结果：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.以小五台山的坐标为原点，按半径1000km取坐标（找出离小五台山1000公里以内的山）

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();}

执行结果：排除小五台自己，找到了鳌山和海陀山

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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