Are there any best practices or guidelines for optimizing progressive image loading with PHP?

Progressive image loading can improve user experience by displaying a low-quality image placeholder first and then loading higher quality versions progressively. To optimize this process in PHP, you can use the GD library to create the placeholder image and then load the full image in chunks using output buffering. 

// Create a low-quality placeholder image using GD library
$placeholder = imagecreatefromjpeg('placeholder.jpg');
imagejpeg($placeholder, 'placeholder.jpg', 30);

// Output the placeholder image first
header('Content-Type: image/jpeg');
readfile('placeholder.jpg');

// Load the full image in chunks and output progressively
$fullImage = fopen('full_image.jpg', 'rb');
while (!feof($fullImage)) {
    echo fread($fullImage, 1024);
    ob_flush();
    flush();
}
fclose($fullImage);

Keywords

progressive image loading optimization PHP guidelines best practices

Related Questions