There are several ways to change the aspect ratio of images in PHP, one of the most common ways is by using the GD library that comes pre-installed with PHP.

Here is an example of how you can use the GD library to change the aspect ratio of an image:

<?php
// Get the original image
$original_image = imagecreatefromjpeg('original.jpg');

// Get the original width and height
$original_width = imagesx($original_image);
$original_height = imagesy($original_image);

// Set the new width and height
$new_width = 800;
$new_height = 600;

// Create a new image with the new aspect ratio
$new_image = imagecreatetruecolor($new_width, $new_height);

// Resize the original image to the new aspect ratio
imagecopyresampled($new_image, $original_image, 0, 0, 0, 0, $new_width, $new_height, $original_width, $original_height);

// Save the new image
imagejpeg($new_image, 'new.jpg', 100);

// Destroy the images to free up memory
imagedestroy($original_image);
imagedestroy($new_image);
?>

In this example, the imagecreatefromjpeg function is used to open the original image, imagesx and imagesy functions are used to get the original width and height of the image, imagecreatetruecolor function is used to create a new image with the desired aspect ratio, imagecopyresampled function is used to resize the original image to the new aspect ratio, imagejpeg function is used to save the new image, and imagedestroy function is used to free up memory.

You can also use other libraries like Imagick, Intervention, Imagine to manipulate and change aspect ratio of an image.

Keep in mind that manipulating image aspect ratio could cause some quality loss in the image.

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