<?php


function GMap_encodeOne($x) {
  $xx = intval($x * 1e5);
  $s = '';

  $xx <<= 1;
  if ($x<0.0) $xx = ~$xx;
  for ($j=6; $j>=0; $j--) 
     if ((($xx>>(5*$j))&0x1F)!=0) 
	break; 
  if ($j==-1) $j=0;
  for ($i=0 ; $i<=$j ; $i++) { 
     s .=  chr( (((xx>>(5*i))&0x1F) 
		 | (j==i ? 0x0 : 0x20)) + 63 ); 
  }
  return s;
}

function GMap_encode($points) {
   $s = '';
   $p0= array(0.0,0.0);
   for ($points as $point) {
      $p = array($point['lat']||$point[0],
		 $point['lon']||$point[1]);
      $s .= GMap_encodeOne($p[0]-$p0[0])
	 .  GMap_encodeOne($p[1]-$p0[1]);
   }
   return $s;
}


?>