How can PHP be used for client-side image editing functionalities?

PHP can be used for client-side image editing functionalities by utilizing libraries such as GD or Imagick. These libraries allow PHP to manipulate images on the server-side based on client-side requests. By sending image data to the server, PHP can perform various editing operations like resizing, cropping, adding filters, and more.

// Example code using GD library to resize an image
$image = imagecreatefromjpeg('image.jpg');
$width = imagesx($image);
$height = imagesy($image);
$newWidth = 200;
$newHeight = ($height / $width) * $newWidth;
$newImage = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
imagejpeg($newImage, 'resized_image.jpg');
imagedestroy($image);
imagedestroy($newImage);