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//create image from existing png file
$im = imagecreatefrompng("overlay.png");
//transparent background and black text
//$bg = imagecolorallocate($im, 0, 0, 0);
//$bg = imagecolortransparent($im,$bg);
$textcolor = imagecolorallocate($im, 0, 0 , 0);
$divNum = 0;
$divNum = $bandwidth / 1000;
$gigNum = $divNum . "Gb";
//convert strings into images
imagestring($im, 5, 32, 20, $gigNum, $textcolor);
//directory in which to save generated images
$savePath = 'images/' . $gigNum . '.png';
//output images to files
header('Content-type: image/png');
imagepng($im, $savePath);
imagedestroy($im);