gist.php

<?php
 $places = array(
  0 =>
   array(
    0 => '-112.121262',
    1 => '33.416515',
   ),
  1 =>
   array(
    0 => '-112.064830',
    1 => '33.419762',
   ),
  2 =>
   array(
    0 => '-112.050127',
    1 => '33.706717',
   ),
  3 =>
   array(
    0 => '-112.105545',
    1 => '33.688492',
   ),
  4 =>
   array(
    0 => '-111.945614',
    1 => '33.290901',
   ),
  5 =>
   array(
    0 => '-111.663908',
    1 => '33.342023',
   ),
  6 =>
   array(
    0 => '-111.993568',
    1 => '33.424774',
   ),
  7 =>
   array(
    0 => '-111.787722',
    1 => '33.504458',
   ),
  8 =>
   array(
    0 => '-111.857654',
    1 => '33.442678',
   ),
 );

 $bbox = new stdClass();
 $bbox->xl = -114;
 $bbox->xr = -110;
 $bbox->yt = 31;
 $bbox->yb = 34;

 $sites = [];
 foreach( $places as $place )
 {
  $point = new Nurbs_Point( $place[0], $place[1] );
  $sites[] = $point;
 }

 // Compute the diagram
 $voronoi = new Voronoi();
 $diagram = $voronoi->compute( $sites, $bbox );

 print_r( $diagram );