<?php 

/* Timing */
set_time_limit(0);
function microtime_float() {
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

$time_start = microtime_float();

try{

$scale=3;
$Cols=180; $Lines=180;
$MaxIter=60;
$MinRe=-2.0; $MaxRe=1.0;
$MinIm=-1.0; $MaxIm=1.0;

$img = ImageCreate($Cols*$scale,$Lines*$scale);

for($n=0; $n<$MaxIter; $n++)
{
  $pitch = (int)($n*256/$MaxIter);
  $c[$n] = ImageColorAllocate($img, $pitch,$pitch,$pitch);
}

$y=0;
for($Im=$MinIm;$Im<=$MaxIm;$Im+=($MaxIm-$MinIm)/$Lines)
{ 
  $x=0;
  for($Re=$MinRe;$Re<=$MaxRe;$Re+=($MaxRe-$MinRe)/$Cols)
  {
    $zr=$Re; $zi=$Im;
    for($n=0;$n<$MaxIter;$n++)
    {
      $a=$zr*$zr; $b=$zi*$zi;
      if($a+$b>4.0) { break; }
      $zi=2*$zr*$zi+$Im; $zr=$a-$b+$Re;
    }
    ImageFilledRectangle($img, $x*$scale, $y*$scale, ($x+1)*$scale-1, ($y+1)*$scale-1, $c[$n]);
    ++$x;
  }
  ++$y;
}
header('Cache-Control: no-store, no-cache, must-revalidate ,proxy-revalidate');     // HTTP/1.1
header('Cache-Control: pre-check=0, post-check=0, max-age=0');    // HTTP/1.1
header ("Pragma: no-cache");
header("Expires: 0");
header('Content-Transfer-Encoding: none'); 
header('Content-type: image/png');

//white init
$white = imagecolorallocate($img, 255, 255, 255);
$time_stop = microtime_float();
$elapsedTime=$time_stop-$time_start;
$string= "Time spent in fetching database rows was ".$elapsedTime." seconds";
imagestring($img, 1, 5, 5, $string, $white);
ImagePng($img);

}

catch(Exception $e){

echo $e->getMessage();

exit();

} ?>