Simple Html DOM Caching - php

Question

I'm using Simple HTML DOM to scrape (with permission) some websites. I basically scrape around 50 different websites with statistical data which is updated around four times a day.
As you can imagine it takes times to do the scraping and therefore I need to speed up the process by doing some caching.
My vision is:
DATA-PRESENTATION.php // where all the results are shown
SCRAPING.php // the code that makes the job
I want to set up a cron job on SCRAPING.PHP in a way it executes 4 times a day and save all the data in caché which then will be requested by DATA-PRESENTATION.PHP making the experience for the user way faster.
My question is how can I implement this caché thing? I'm very rookie at PHP, I've been reading tutorials but they are not very helpfull and there are just a few so I just couldn't really learn how to do it.
I know other solution might be implementing a database but I don't want to do that. Also, I've been reading about high end solutions like memcached, but the site is very simple and for personal use, so I don't need that kind of stuff.
Thanks!!
SCRAPING.PHP
<?php
include("simple_html_dom.php");
// Labour stats
$html7 = file_get_html('http://www.website1.html');
$web_title = $html7->find(".title h1");
$web_figure = $html7->find(".figures h2");
?>
DATA-PRESENTATION.PHP
<div class="news-pitch">
<h1>Webiste: <?php echo utf8_encode($web_title[0]->plaintext); ?></h1>
<p>Unemployment rate: <?php echo utf8_encode($web_figure[0]->plaintext); ?></p>
</div>
FINAL CODE! Many thanks #jerjer and #PaulD.Waite, I couldn't really get this done without your help!
Files:
1- DataPresentation.php // here I show the data requested to Cache.html
2- Scraping.php // here I scrape the sites and then save the results to Cache.html
3- Cache.html // here the scraping results are saved
I set up a Cron Job on Scraping.php telling it to overwrite Cache.html each time.
1- DataPresentation.php
<?php
include("simple_html_dom.php");
$html = file_get_html("cache/test.html");
$title = $html->find("h1");
echo $title[0]->plaintext;
?>
2- Scraping.php
<?php
include("simple_html_dom.php");
// by adding "->find("h1")" I speed up things as it only retrieves the information I'll be using and not the whole page.
$filename = "cache/test.html";
$content = file_get_html ('http://www.website.com/')->find("h1");
file_put_contents($filename, $content);
?>
3- Cache.html
<h1>Current unemployment 7,2%</h1>
It loads immediately and by setting things this way I assure there's always a Caché file to be loaded.

Answer 1

Here is a sample of a file-based caching:
<?php
// Labour stats
$filename = "cache/website1.html";
if(!file_exists($filename)){
$content = file_get_contents('http://www.website1.html');
file_put_contents($filename, $content);
}
$html7 = file_get_html($filename);
$web_title = $html7->find(".title h1");
$web_figure = $html7->find(".figures h2");
?>

Answer 2

Try using Zend_Cache library from Zend_Framework. It's quite simple to use:
function loadHtmlWithCache($webAddress){
$frontendOptions = array(
'lifetime' => 7200, // cache lifetime of 2 hours
'automatic_serialization' => true
);
$backendOptions = array(
'cache_dir' => './tmp/' // Directory where to put the cache files
);
// getting a Zend_Cache_Core object
$cache = Zend_Cache::factory('Core',
'File',
$frontendOptions,
$backendOptions);
if( ($result = $cache->load($webAddress)) === false ) {
$html7 = file_get_html($webAddress);
$web_title = $html7->find(".title h1");
$web_figure = $html7->find(".figures h2");
$cache->save($webAddress,array('title'=>$web_title,'figure' => $web_figure));
} else {
// cache hit! shout so that we know
$web_title = $result['title'];
$web_figure = $result['figure'];
}
}