php根據經緯度排序，根據經緯度篩選距離段

sql 語句：select location.* from (select *,round(6378.138*2*asin(sqrt(pow(sin( (36.668530*pi()/180-px_lat*pi()/180)/2),2)+cos(36.668530*pi()/180)*cos(px_lat*pi()/180)* pow(sin( (117.020359*pi()/180-px_lon*pi()/180)/2),2)))*1000)  as distance from bsx_training where (px_state = 1) and (type_id != '') and (((px_lat >= 27.683290277922) and (px_lat <= 45.653769722078)) and ((px_lon >= 105.81826766053) and (px_lon <= 128.22245033947))) order by  distance limit 0,10) location  where (1=1) and (location.distance <= 500)
先忽略上面這條sql語句。一一解釋
根據sql排序的sql語句

// lon1當前使用者經度 lat1當前使用者緯度，lon2 sql的經度字段 lat sql的緯度字段
function distance_sql($lon1,$lat1,$lon2,$lat2
)*pi()/180-*pi()/180)/2),2)+cos(*pi()/180)*cos(*pi()/180)* pow(sin( (*pi()/180-*pi()/180)/2),2)))*1000) ";
return
$sql
;}

這是乙個生成根據sql排序函式**

接下來下面是設定經緯度範圍內的資料

// 當前登入使用者經緯度
if(i("post.location"))) and (px_lat <= )) and ((px_lon >= ) and (px_lon <= )))";
//經緯度距離優先排序，距離最近優先顯示
if(i("post.distance_sort"))
if(i("post.km")))";
}else
if(strpos($kmstr,"-") !== false
)) and (location.distance <= ))";
}else
if(strpos($kmstr,">") !== false
))";}}
}

下面算出經緯度範圍內的資料控制函式

/*
* * 
* @param  $latitude    緯度    
* @param  $longitude    經度
* @param  $raidus        半徑範圍(單位：公尺)
* @return multitype:number */
function getaround($latitude,$longitude,$raidus
)

要實現根據經緯度排序

就直接呼叫distance_sql(lon1,lat1,lon2,lat2)傳入引數並且as 乙個別名例如 as distance，然後sql語句中 order by 排序根據 distance排序

如果篩選距離段 1000公尺-2000公尺的資料

那就sql語句巢狀sql

select *.loation from (select *,round(6378.138*2*asin(sqrt(pow(sin( (36.668530*pi()/180-px_lat*pi()/180)/2),2)+cos(36.668530*pi()/180)*cos(px_lat*pi()/180)* pow(sin( (117.020359*pi()/180-px_lon*pi()/180)/2),2)))*1000) as distance) from table location where (location.distance >= 1000) and (location.distance <= 2000))

如果實現根據最近位置排序sql

select *,round(6378.138*2*asin(sqrt(pow(sin( (36.668530*pi()/180-px_lat*pi()/180)/2),2)+cos(36.668530*pi()/180)*cos(px_lat*pi()/180)* pow(sin( (117.020359*pi()/180-px_lon*pi()/180)/2),2)))*1000) as distance order by distance

public
function
training_list()
) and (px_lat <= )) and ((px_lon >= ) and (px_lon <= )))";
//經緯度距離篩選
if(i("post.distance_sort"))
if(i("post.km")))";
}else
if(strpos($kmstr,"-") !== false
)) and (location.distance <= ))";
}else
if(strpos($kmstr,">") !== false
))";}}
}$shownum = 10;
if(i("post.page"))
else
$n = ($page-1)*$shownum
;        
$field = "*";
$sql = "select location.* from (select  from bsx_training where  order by  limit ,) location ";
$training = m()->query($sql
);        
dump(m()->getlastsql());die
;     
}

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