How can PHP developers ensure that the images displayed on their websites are optimized for performance?

To ensure that images displayed on websites are optimized for performance, PHP developers can use image optimization techniques such as compressing images, resizing images to the correct dimensions, lazy loading images, and using responsive images. This helps reduce the file size of images, decrease load times, and improve overall website performance.

// Example PHP code snippet for optimizing images using the GD library

// Load the image
$image = imagecreatefromjpeg('example.jpg');

// Resize the image to desired dimensions
$newWidth = 500;
$newHeight = 300;
$resizedImage = imagescale($image, $newWidth, $newHeight);

// Compress the image and output to a file
imagejpeg($resizedImage, 'optimized_example.jpg', 80);

// Free up memory
imagedestroy($image);
imagedestroy($resizedImage);