Below is a simple caching script using PHP and JavaScript. This script caches the results of an API call on the server side (PHP) and retrieves it on the client side (JavaScript).
cache.php)<?php
// Set the cache file path
$cacheFile = 'cache/data_cache.json';
// Set cache lifetime (in seconds)
$cacheLifetime = 300; // Cache for 5 minutes
// Check if the cache file exists and is not expired
if (file_exists($cacheFile) && (filemtime($cacheFile) > (time() - $cacheLifetime))) {
// Cache is valid, read the data from the cache
$data = file_get_contents($cacheFile);
} else {
// Cache is expired or does not exist, fetch fresh data
// This is where you would typically fetch data from an API or database
$data = fetchFreshData(); // Assume this function fetches your data
// Save the fresh data to the cache file
file_put_contents($cacheFile, $data);
}
// Set the content type to JSON
header('Content-Type: application/json');
echo $data;
// Function to fetch fresh data (mockup)
function fetchFreshData() {
$freshData = [
'message' => 'This is fresh data!',
'timestamp' => time()
];
return json_encode($freshData);
}
?> JavaScript to Retrieve Cached Data (script.js)
// Fetch the cached or fresh data from the PHP script
fetch('cache.php')
.then(response => {
// Check if the response is ok (status 200)
if (!response.ok) {
throw new Error('Network response was not ok');
}
return response.json(); // Parse the JSON data
})
.then(data => {
// Process the received data
console.log('Received Data:', data);
document.getElementById('output').innerText = data.message + ' (Fetched at: ' + new Date(data.timestamp * 1000).toLocaleTimeString() + ')';
})
.catch(error => {
console.error('There was a problem with the fetch operation:', error);
}); HTML Example to Use the JavaScript
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Caching Example</title>
<script src="script.js" defer></script>
</head>
<body>
<h1>Cache Example</h1>
<div id="output">Loading...</div>
</body>
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