PHP-FPM performance optimization example: method to improve website image loading speed

PHP-FPM Performance Optimization Example: Methods to Improve Website Picture Loading Speed

Abstract: In today’s Internet era, pictures occupy an important position in websites. And fast loading of images is crucial to improving user experience. This article will introduce some methods to improve website image loading speed through examples of PHP-FPM performance optimization, and provide specific code examples.

1. Use image compression technology
   Image compression is a common method to improve the loading speed of website images. You can download images faster by reducing their file size. In PHP, you can use some third-party libraries or extensions to achieve image compression, such as ImageMagick, GD library, etc. The following is a sample code that uses the GD library for image compression:

<?php
function compressImage($source, $destination, $quality) {
    $image = imagecreatefromjpeg($source);
    imagejpeg($image, $destination, $quality);
    imagedestroy($image);
}

compressImage("source.jpg", "destination.jpg", 80);
?>

2. Image lazy loading
   Image lazy loading refers to delaying the loading of images on the page. When the user scrolls to where the image is, position before loading. This approach can reduce page loading time and improve user experience. The following is a sample code that uses jQuery to implement lazy loading of images:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(function() {
    $("img.lazy").lazyload();
});
</script>

<img class="lazy lazy"  src="/static/imghwm/default1.png"  data-src="placeholder.jpg"  data-original="real-image.jpg" alt="Lazy Loaded Image">

3. CDN acceleration
   CDN (content distribution network) is a technology that distributes content to nodes around the world. Can speed up website access speed. Using CDN services can cache image resources closer to users, providing faster image loading speeds. The following is an example of using CloudFlare CDN for image acceleration:

<img src="/static/imghwm/default1.png"  data-src="https://example.com/image.jpg?x-oss-process=image/resize,p_40"  class="lazy" alt="CDN Accelerated Image">

4. Loading multiple images in parallel
   When loading multiple images at the same time in a web page, you can use parallel loading. Improve loading speed. By using multiple parallel HTTP requests in a page, the waiting time for a single request can be reduced, thereby speeding up image downloads. The following is an example of using multiple threads to load images in parallel:

<?php
function getImage($url) {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec($ch);
    curl_close($ch);
    return $response;
}

$urls = array("image1.jpg", "image2.jpg", "image3.jpg");
$responses = array();
$threads = array();

foreach ($urls as $url) {
    $thread = new Thread('getImage', $url);
    $thread->start();
    $threads[] = $thread;
}

foreach ($threads as $thread) {
    $thread->join();
    $responses[] = $thread->getResponse();
}

foreach ($responses as $response) {
    echo "<img  src='data:image/jpeg;base64," . base64_encode($response) . "' alt="PHP-FPM performance optimization example: method to improve website image loading speed" >";
}
?>

5. Image loading based on browser cache
   Browser cache is a way to save resources locally so that they can be loaded the next time Technology that loads faster when accessed. By taking advantage of browser caching, you can avoid downloading images repeatedly, thereby increasing loading speeds. On the server side, caching behavior can be controlled by setting HTTP response headers. The following is a sample code for setting the image cache expiration time:

<?php
$filename = "image.jpg";
$expiry = 60 * 60 * 24 * 7; // 缓存过期时间为7天

header("Pragma: public");
header("Cache-Control: max-age=" . $expiry);
header("Expires: " . gmdate("D, d M Y H:i:s", time() + $expiry) . " GMT");
header("Content-type: image/jpeg");
readfile($filename);
?>

Summary: Through the example of PHP-FPM performance optimization, this article introduces some methods to improve the website image loading speed, and provides specific code example. By using image compression technology, image lazy loading, CDN acceleration, parallel loading of multiple images, and browser cache-based image loading, we can greatly improve the image loading speed of the website and improve the user experience.

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