Description:
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I have a function which creates a polygon of blue color. I call this function inside a loop of 128 iterations. For every iteration, i change the value of x and y so that my polygon is rendered on new location. This goes fine and i get 128 new polygons on my image after running the script. But if change the number to 129, the 129th polygon is transparent or what i cannot guess.It  just does not display or render at all. Is this a bug or some mistake with my code?

I am using php version 5.1.4 that came with WAMP5 Version 1.6.3





Reproduce code:
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$im = imagecreate(600, 400);
$x = 20;
$y = 350;
for($i=1;$i<=128;$i++) //create a polygon 128 times
	{
		drawPoly($x,$y,$im);
		$x = $x+2;
		$y = $y-2;
	}
	header('Content-type: image/png');
	imagepng($im);
	imagedestroy($im);	
	function drawPoly($xCoord,$yCoord,$im)
	{
		$x1 = $x2 = $xCoord;
		$x3 = $x4 = $xCoord + 70;
		$y1 = $y4 = $yCoord;
		$y2 = $y3 = $yCoord + 30;
		$Poly = array(0  => $x1,1  => $y1,2  => $x2,3  => $y2,4  => $x3,5  => $y3,6  => $x4,7  => $y4);
		$bg   = imagecolorallocate($im, 150, 150, 150);
		$blue = imagecolorallocate($im, 0, 0, 255);
		imagefilledpolygon($im, $Poly, 4, $blue);
	}

Expected result:
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i expect to see the polygon even after my loop exceeds 128

Actual result:
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What i can see now is only 128 polygons created perfectly not more than that.