How to get the coordinates of several points on the circle with php

Question

I have a few points. I need to put those points on a circle and get their coordinates.

function positionX($numItems,$thisNum){ 
  $alpha = 360/$numItems; //          


        

Answer 1

The cos() and sin() functions expect the argument in radians, not in degrees.

Use the deg2rad() function to convert

EDIT

CODE:

function positionX($numItems,$thisNum){
  $alpha = 360/$numItems; // angle between the elements
  $r = 1000; // radius
  $angle = $alpha * $thisNum; // angle for N element
  $x = $r * cos(deg2rad($angle)); // X coordinates
  return $x;
}

function positionY($numItems,$thisNum){
  $alpha = 360/$numItems; // angle between the elements
  $r = 1000; // radius
  $angle = $alpha * $thisNum; // angle for N element
  $y = $r * sin(deg2rad($angle)); // Y coordinates
  return $y;
}

echo round(positionX(4,1))."
";
echo round(positionY(4,1))."

";

echo round(positionX(4,2))."
";
echo round(positionY(4,2))."

";

echo round(positionX(4,3))."
";
echo round(positionY(4,3))."

";

echo round(positionX(4,4))."
";
echo round(positionY(4,4))."

";

RESULTS:

0
1000

-1000
0

-0
-1000

1000
-0