/dev/null 2>&1 ;\n";
$command .= $path_to_dvipng . " -D " . $res . " -q -T tight ". $filename . ".dvi -o " . $filename . ".png > /dev/null 2>&1 ;\n";

$output = `$command`;

$handle = @fopen($filename . ".png", "r");
if ($handle) {
while (!feof($handle)) {
$buffer = fgets($handle, 4096);
echo $buffer;
}
fclose($handle);
}

unlink($filename . ".tex");
unlink($filename . ".log");
unlink($filename . ".aux");
unlink($filename . ".dvi");
unlink($filename . ".png");
?>