Untitled

<?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();
    }
}

?>