Simple PHP Object Caching

cache.php

<?php
// Super simple caching class
class PhpCache {
	protected $path = null;
	protected $duration = null;
	
	function __construct ( $path, $duration = 60) {
		$this->path = $path;
		$this->duration = $duration;
	}
	
	function get( $id ) {
		$file = $this->path . $id . '.cache';
		if (file_exists($file) && time() - filemtime($file) < $this->duration) {
			return unserialize( file_get_contents($file) );			
		} else {
			return null;
		}
	}
	
	function set( $id, $obj) {
		$file = $this->path . $id . '.cache';
		file_put_contents($file, serialize($obj));
	}
}
?>

<?
// Usage
$cache = new PhpCache(dirname(__FILE__).'\\cache\\', 600);
$key = 'mykey';

$value = $cache->get($key);
if ($value == null) {
	$value = 'new value';
	$cache->set($key, $value);
	echo 'created ' . $value;
} else {
	echo 'got ' . $value;
}

Awesomely simple little script :)

Quick and easy to implement, and even easier to modify to add a few more features like cache filename prefixes, and durations for specific cache ID's.

Race condition problem: between when has() reports, and actual access of the cache, the state may change.

If you are on Linux, change \\cache\\ to /cache/