PHP | Imagick setImageUnits() Function

<?php

// PHP program to illustrate 
// seImageUnits function
$image = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png');

// Use getImageUnits function
$units = $image->getImageUnits();
echo "units Before SetUnit = ";
print_r($units);

// set image unit = 1
$image->setImageUnits(1);

// Display the output
$units = $image->getImageUnits();
echo "</br>units After Set = ";
print_r($units);

?>

 <?php
$i = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png');

$r = $i->getImageResolution();
$u = $i->getImageUnits();
echo "print previous resolution = ";
print_r($r);

// print units
echo "</br>Check units  = ";
print_r($u);

// for units are based on below resolution
//0=undefined, 1=pixelsperInch, 2=PixelsPerCentimeter

// checking if units = 2
// then set unit = 1
if ($u == Imagick::RESOLUTION_PIXELSPERCENTIMETER) {
   $r[x] = (int)round($r[x] * 2);
   $r[y] = (int)round($r[y] * 2);
   $i->setImageUnits(Imagick::RESOLUTION_PIXELSPERINCH);
   $i->setImageResolution($r[x], $r[y]);

  //note that the number type is double again
   $r = $i->getImageResolution();
}

// print resolution after
echo "</br>resolution after ";
print_r($r);

$u = $i->getImageUnits();

echo "</br>units After Set  = ";
print_r($u);
?>