PhpFastCache Guide

Thor

Thor

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Hoping someone would be willing to explain/show me how to use this library.

Normally for caching, I used the file system, roughly like this:

PHP: 
<?php
	// define the path and name of cached file
	$cachefile = 'cached-files/'.date('M-d-Y').'.php';
	// define how long we want to keep the file in seconds. I set mine to 5 hours.
	$cachetime = 18000;
	// Check if the cached file is still fresh. If it is, serve it up and exit.
	if (file_exists($cachefile) && time() - $cachetime < filemtime($cachefile)) {
   	include($cachefile);
    	exit;
	}
	// if there is either no file OR the file to too old, render the page and capture the HTML.
	ob_start();
?>
	<html>
		output all your html here.
	</html>
<?php
	// We're done! Save the cached content to a file
	$fp = fopen($cachefile, 'w');
	fwrite($fp, ob_get_contents());
	fclose($fp);
	// finally send browser output
	ob_end_flush();
?>

What I want to do now is use the PhpFastCache library instead. What I want is for someone to show me how you would handle DB queries.

Take for example this test page:

PHP: 
<table style="width:100%">
  <tr>
    <th>Name</th>
    <th colspan="2">Cellphone</th>
  </tr>
  <tr>
<?php
$stmt = $pdo->query('SELECT name, cellphone FROM users');
foreach ($stmt as $row)
{
    echo <td>. $row['name'] .</td>;
    echo <td>. $row['cellphone'] .</td>;
}
?>
  </tr>
</table>

How would you go about to cache that using phpFastCache and then what driver would you use, SQLite or the Filesystem?
 
Last edited:
Did you read the documentation? Surely there is a getting started guide?

Caching data belongs in your service layer, not in your views.


The driver I would use is predis/redis. But this is largely irrelevant, they are all implementations of the same interface and are interchangeable.

If the above code is a snapshot of how you are actually structuring php apps, you should not be looking at caching. Your complexity and unmaintainability will skyrocket.

Using a service layer and https://github.com/phpro/annotated-cache is the way I would go. Caching now becomes meta information instead of an implementation detail
 
Last edited:
_kabal_ said:
Caching data belongs in your service layer, not in your views.
Click to expand...

Just a simple example to explain it, no need for MVC/OOP and other stuff.


_kabal_ said:
If the above code is a snapshot of how you are actually structuring php apps, you should not be looking at caching. Your complexity and unmaintainability will skyrocket.
Click to expand...

Stop making assumptions, again illustrative only.

_kabal_ said:
The driver I would use is predis/redis. But this is largely irrelevant, they are all implementations of the same interface and are interchangeable.
Click to expand...

I don't find it irrelevant, if I use SQLite then DB queries and access times will be different than if I use the filesystem where if you host on a SSD should be fine vs Disk drives and Memory will be different to SSD as well.

Off-topic, but what I was trying to ask is if the aim is to limit DB queries, would caching to SQLite be the right way, essentially just a different DB vs using the filesystem or memory instead.

Back to the question, how would you write this using PhpFastCache:

PHP: 
<table style="width:100%"> 
  <tr> 
    <th>Name</th> 
    <th colspan="2">Cellphone</th> 
  </tr> 
  <tr> 
<?php 
$stmt = $pdo->query('SELECT name, cellphone FROM users'); 
foreach ($stmt as $row) 
{ 
    echo <td>. $row['name'] .</td>; 
    echo <td>. $row['cellphone'] .</td>; 
} 
?> 
  </tr> 
</table>
 
You asked which driver to use. You did not specify anything about the environment.

Also I told you which driver I recommend. Redis. I don’t recommend SQLite, and filesytem would be used for local development mostly.

From the README.md/documentation on the github repository:

Code: 
use phpFastCache\Helper\Psr16Adapter;

$Psr16Adapter = new Psr16Adapter($defaultDriver);

if(!$Psr16Adapter->has('test-key')){
    // Setter action
    $data = 'lorem ipsum';
    $Psr16Adapter->set('test-key', 'lorem ipsum', 300);// 5 minutes
}else{
    // Getter action
    $data = $Psr16Adapter->get('test-key');
}

Just replace the

Code: 
    $data = 'lorem ispum”

part

BUT

you won’t be able to cache a PDO statement. It throws an exception in the __serialize method, which is what caching libraries use to turn a php object into a non php context.

Normally you do not cache database results. You cache the result of a function that returns the array of dataset result rows mapped to domain objects
 
Last edited:
_kabal_ said:
You asked which driver to use. You did not specify anything about the environment.

Also I told you which driver I recommend. Redis. I don’t recommend SQLite, and filesytem would be used for local development mostly.

From the README.md/documentation on the github repository:

Code: 
use phpFastCache\Helper\Psr16Adapter;

$Psr16Adapter = new Psr16Adapter($defaultDriver);

if(!$Psr16Adapter->has('test-key')){
    // Setter action
    $data = 'lorem ipsum';
    $Psr16Adapter->set('test-key', 'lorem ipsum', 300);// 5 minutes
}else{
    // Getter action
    $data = $Psr16Adapter->get('test-key');
}

Just replace the

Code: 
    $data = 'lorem ispum”

part
Click to expand...

Makes zero sense, please type it out.

This is what the documentation says, not sure where you got your code from.

PHP: 
<?php
/**
 *
 * This file is part of phpFastCache.
 *
 * @license MIT License (MIT)
 *
 * For full copyright and license information, please see the docs/CREDITS.txt file.
 *
 * @author Khoa Bui (khoaofgod)  <[email protected]> http://www.phpfastcache.com
 * @author Georges.L (Geolim4)  <[email protected]>
 *
 */
// Include composer autoloader
require __DIR__ . '/../../vendor/autoload.php';
// OR require_once("../src/phpFastCache/phpFastCache.php");
date_default_timezone_set("Europe/Paris");
use phpFastCache\CacheManager;
use phpFastCache\Core\phpFastCache;
// Setup File Path on your config files
CacheManager::setDefaultConfig([
  "path" => sys_get_temp_dir(),
]);
// In your class, function, you can call the Cache
$InstanceCache = CacheManager::getInstance('sqlite');
// OR $InstanceCache = CacheManager::getInstance() <-- open examples/global.setup.php to see more
/**
 * Try to get $products from Caching First
 * product_page is "identity keyword";
 */
$key = "product_page";
$CachedString = $InstanceCache->getItem($key);
if (is_null($CachedString->get())) {
    //$CachedString = "Files Cache --> Cache Enabled --> Well done !";
    // Write products to Cache in 10 minutes with same keyword
    $CachedString->set("Files Cache --> Cache Enabled --> Well done !")->expiresAfter(5);
    $InstanceCache->save($CachedString);
    echo "FIRST LOAD // WROTE OBJECT TO CACHE // RELOAD THE PAGE AND SEE // ";
    echo $CachedString->get();
} else {
    echo "READ FROM CACHE // ";
    echo $CachedString->getExpirationDate()->format(Datetime::W3C);
    echo $CachedString->get();
}
echo '<br /><br /><a href="/">Back to index</a>&nbsp;--&nbsp;<a href="./' . basename(__FILE__) . '">Reload</a>';
 
I have added more detail to the bottom of my previous post
 
PHP: 
<table style="width:100%">  
  <tr>  
    <th>Name</th>  
    <th colspan="2">Cellphone</th>  
  </tr>  
  <tr>  
<?php  
$users = $userRepository->findAll();  
foreach ($users as $user)  
{  
    echo <td>. $user['name'] .</td>;  
    echo <td>. $user['cellphone'] .</td>;  
}  
?>  
  </tr>  
</table>

becomes

PHP: 
<table style="width:100%">  
  <tr>  
    <th>Name</th>  
    <th colspan="2">Cellphone</th>  
  </tr>  
  <tr>  
<?php
$cache = new Psr16Adapter($defaultDriver);


if(!$cache->has('users')){
    $users = $userRepository->findAll();
    $cache->set('users', $users, 300);// 5 minutes
}else{
    $users = $cache->get('users');
}

foreach ($users as $user)  
{  
    echo <td>. $user['name'] .</td>;  
    echo <td>. $user['cellphone'] .</td>;  
}  
?>  
  </tr>  
</table>
 
Really glad I spent the time and effort to give real replies here.
 
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