Tiny Cache system

file_cache_contents.php

<?php
//Tiny Cache system 
function file_cache_contents($url, $cache_time=360000) { // 60*60*5
    $cache_dir  = __DIR__.'/cache/';
    $cache_file = $cache_dir.md5($url).'.cache';
    @mkdir($cache_dir, 0775, true);
    // return data from cached file if file exists and not expired
    if(file_exists($cache_file) && filemtime($cache_file)+$cache_time >= time()) {
        return(unserialize(file_get_contents($cache_file)));
    }
    // get data from url and cache it then return the data
    $cache_data = file_get_contents($url);
    file_put_contents($cache_file, serialize($cache_data), LOCK_EX);
    return($cache_data);
}
?>