<?php
// Define the cache expiration time (in seconds)
$cache_expiration_time = 3600;
// Define the file path to be cached
$file_path = "/path/to/your/file.txt";
// Check if the cache file exists and is still valid
if (file_exists($file_path . ".cache") && time() - filemtime($file_path . ".cache") < $cache_expiration_time) {
// If so, output the cached file contents
echo file_get_contents($file_path . ".cache");
} else {
// Otherwise, asynchronously prewarm the cache and output the original file contents
// Start a background process to prewarm the cache asynchronously
$pid = pcntl_fork();
if ($pid == -1) {
die('Error: could not fork');
} else if ($pid) {
// Parent process: continue executing and output the original file contents
// Read the original file contents
$file_contents = file_get_contents($file_path);
// Output the original file contents
echo $file_contents;
// Write the original file contents to the cache file
file_put_contents($file_path . ".cache", $file_contents);
} else {
// Child process: prewarm the cache asynchronously
// Read the file contents (this will trigger any necessary file system caching)
file_get_contents($file_path);
// Sleep for six hours before exiting (this will allow the cache to be prewarmed asynchronously)
sleep(6 * 60 * 60);
// Exit the child process
exit();
}
}
?>