What are the benefits of saving resized images to a separate file rather than generating them at runtime in PHP?

Saving resized images to a separate file rather than generating them at runtime in PHP can improve performance by reducing the processing time needed to resize the image each time it is requested. Additionally, it can reduce server load and bandwidth usage by serving pre-resized images instead of resizing them on-the-fly for each request. This approach also allows for better caching and optimization of images for different devices or resolutions. 

<?php
function resizeImage($source, $destination, $width, $height) {
    $image = imagecreatefromjpeg($source);
    $resizedImage = imagescale($image, $width, $height);
    imagejpeg($resizedImage, $destination);
    imagedestroy($image);
    imagedestroy($resizedImage);
}

$sourceImage = 'original.jpg';
$destinationImage = 'resized.jpg';
$width = 200;
$height = 150;

resizeImage($sourceImage, $destinationImage, $width, $height);
?>

Keywords

image resizing file storage performance optimization caching GD library

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