How to create a simple PHP cache script

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$cache_file =  getcwd().'/filename.cache';

if (file_exists($cache_file) && (filemtime($cache_file) > (time() - 60 * 9 ))) {

    header('Content-Type: application/json');
    echo file_get_contents($cache_file);

} else {

    $feed = "content to cache";

    file_put_contents($cache_file, $feed, LOCK_EX);
    echo $feed;

}

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