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                            ```php
/**
*
* 根據兩點的經緯度計算距離
* @author zhengshaozhuo
* @version 2015-08-10
*/
function calc_distance_by_pos($o_lat, $o_lng, $t_lat, $t_lng){
$pk = 180 / 3.14169;
$_a1 = $o_lat / $pk;
$_a2 = $o_lng / $pk;
$_b1 = $t_lat / $pk;
$_b2 = $t_lng / $pk;

$t1 = cos($_a1) * cos($_a2) * cos($_b1) * cos($_b2);
$t2 = cos($_a1) * sin($_a2) * cos($_b1) * sin($_b2);
$t3 = sin($_a1) * sin($_b1);

$tt = acos($t1 + $t2 + $t3);
return (int)(6366000 * $tt);
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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