How to: crop and resize using imagick PHP

$im = new imagick("c:\\temp\\523764_169105429888246_1540489537_n.jpg");
$imageprops = $im->getImageGeometry();
$width = $imageprops['width'];
$height = $imageprops['height'];
if($width > $height){
    $newHeight = 80;
    $newWidth = (80 / $height) * $width;
}else{
    $newWidth = 80;
    $newHeight = (80 / $width) * $height;
}
$im->resizeImage($newWidth,$newHeight, imagick::FILTER_LANCZOS, 0.9, true);
$im->cropImage (80,80,0,0);
$im->writeImage( "D:\\xampp\\htdocs\\th_80x80_test.jpg" );
echo '<img src="th_80x80_test.jpg">';

This should work. The cropImage parameters (0 and 0) determine the upper left corner of the cropping area. So playing with these gives you differnt results of what stays in the image.