Download - Basic File Cache Tutorial - PHP
Basic File Caching
Overview
Objective
Learn the basics of caching data in ProdigyView to help speed up your server’s performance.
Requirements
Basic Understanding of Cache
Estimated Time
12 Minutes
Follow Along With Code Example
1. Download a copy of the example code at www.prodigyview.com/source.
2. Install the system in an environment you feel comfortable testing in.
3.Proceed to examples/system/Cache.php
Create Cache
Writing a file to cache is relatively simple. All you need is a key/name and content to put in the cache.
1. Initialize the cache object
2. Set the key/name 3. Write content to cache
Adding Options
Cache uses the default values that can be set in PVCache::init(). To override those default values, we can pass in our own options.
Modify Cache Expiration and the name of the cache
Set the expiration time in seconds
Reading The Cache
With cache that is stored, we need a way of reading it. They key/name used to save the cache will also be used for reading it.
The Cache TagBy default, the tag used to identify the cache is removed, If you want to read the cache tag, pass the options in not to remove the tag.
Set the option keeping the cache tag
Remember to set the cache name if not using the default
Cache Tag Results
Cache Tag
Cache Tag With Explicitly Set Name
Checking ExpirationOh, so that is the tag used for setting the expiration. Wait, how do you check the expiration? Simply pass the key/name of the file to check.
Check if the cache has expired by the key
Check name and key
Expiration DateIf you need to pull the expiration date from the file, PVCache::getExpiration() method will pull the date for you in a string format.
Get the expiration in a date format
Add the option to use a name for the cache
Expiration Date Result
Expiration date/time format
Delete CacheThe final step to manipulating the cache is to delete the cache. After it is deleted, accessing cache through that key will return a null.
Objects And Array
One of the coolest features about the cache in ProdigyView is the ability to store objects and arrays into cache. These data structures will be serialized on entry and unserialized on retrieval.
Set the cache key/name Pass array into cache
Read the cache as normal and print out key
How to use cacheWe know how to read, write, check and delete cache, but we actually use it? Simple, check then read or write.
1. Check if the cache has expired first 2. If is not expired, return the cache
3. If it has expired, query that database to find your content.
4. Write the content to cache and return it
Challenge!
This is an optional challenge to improve you understanding of cache.
1. Create a page with header , body and footer content in a string.
2. Write the header content to cache and set to expire in 3 minutes.
3. Write the body content to cache and set to expire in 5 minutes.
4. Write the footer content to cache and set to expire in 7 minutes.
5. Add new content to each section of the page only after the content has expired.
API ReferenceFor a better understanding of cache in ProdigyView, visit the api by clicking on the link below.
PVCache
www.prodigyview.com
More Tutorials
For more tutorials, please visit:
http://www.prodigyview.com/tutorials