imagick crash with PHP 5.3

I'm getting this error:

The connection to the server was reset while the page was loading.

PDF to JPG conversion using PHP

I'm trying to convert PDF to IMG (JPG) with help PHP.

How to read an SVG with a given size using PHP Imagick?

I have the following code:

$image = new Imagick();

$image->setBackgroundColor(new ImagickPixel('green'));

$image->setSize(20,20);

$image->readImageBlob(file_get_contents('./some/path/image.svg'));