如何确定位置是否在正方形（lat，lon）PHP内

Question

How can you figure out if this:

$Now = array(
'lat' => '59.565423',
'long' => '7.347268'
);

is inside this:

$x = array(
'x1' => '59.570281',  // point 1, north west - lat
'y1' => '7.341667',   // ^^^^^^ - lon
'x2' => '59.570281',  // point 2, north east - lat
'y2' => '7.351087',   // ^^^^^^ - lon
'x3' => '59.568195',  // point 3, south east - lat
'y3' => '7.351087',   // ^^^^^^ - lon
'x4' => '59.568195',  // point 4, south west - lat
'y4' => '7.341667'    // ^^^^^^ - lon
 );

Supposed to return 1 if inside or 0 if outside.

Answer 1

Here is how:

• first you need to check if longitude is within your |---| area so:

  if($Now['long'] > $x['y1'] && $Now['long'] < $x['y2'])

  • then you need to check if the latitude is within the parameters:

  if($Now['lat'] < $x['x1'] && $Now['lat'] > $x['x4'])

Whole function:

function InsideOrNot($Now, $x){
    //If 0 is within |----| (|--0--|)
    if($Now['long'] > $x['y1'] && $Now['long'] < $x['y2']){

        //if 0 is within ___
        //                |
        //               ___   
        if($Now['lat'] < $x['x1'] && $Now['lat'] > $x['x4']){
            return 1;
        }

        else{
            return 0;
        }
    }
    else{
        return 0;
    }


}

Now: echo InsideOrNot($Now, $x);