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Gmagick's rollimage() function in PHP is used to roll an image vertically or horizontally.

The rollimage() function takes two parameters: the number of pixels to roll vertically and the number of pixels to roll horizontally.

Here is an example of how to use the rollimage() function:

php
<?php
// Create a Gmagick object
$image = new Gmagick('path/to/image.jpg');

// Roll the image vertically by 10 pixels
$image->rollimage(0, 10);

// Roll the image horizontally by -5 pixels
$image->rollimage(-5, 0);

// Display the rolled image
header('Content-type: image/jpeg');
echo $image;
?>


In this example, the image is first loaded using the Gmagick constructor. Then, the rollimage() function is called to roll the image vertically by 10 pixels and horizontally by -5 pixels. Finally, the rolled image is displayed using the appropriate header and echo statement.

Note that Gmagick is an image manipulation library that provides an object-oriented interface to ImageMagick. So, to use Gmagick in PHP, you need to have the Gmagick extension and ImageMagick installed on your server.