PHP-FPM性能优化实例：提高网站图片加载速度的方法

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

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

<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" src="placeholder.jpg" data-original="real-image.jpg" alt="Lazy Loaded Image">

<img src="https://example.com/image.jpg" alt="CDN Accelerated Image">

<?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) . "'>";
}
?>

<?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);
?>