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

Thats because you are not using radiants in your sin() and cos() functions. You need to convert angels into radiants. Look at the function description of sin(), there you find that the arg is in radiants.

Reminder

1° = 2 PI / 360;

Edit

I can't seem to find the error in your code, try this one instead

function($radius, $points, $pointToFind) {

 $angle = 360 / $points * 2 * pi(); //angle in radiants

 $x = $radius * cos($angle * $pointToFind);
 $y = $radius * sin($angle * $pointToFind);

}