Basic File Cache Tutorial - PHP

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Presentation Description

Learn the basics of writing, reading and checking expiration of file cache.


Presentation Transcript

Basic File Caching:

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:

Follow Along With Code Example Download a copy of the example code at . Install the system in an environment you feel comfortable testing in. Proceed to examples/system/ Cache.php

Create Cache:

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:

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:

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 Tag:

The Cache Tag By 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 Results Cache Tag Cache Tag With Explicitly Set Name

Checking Expiration:

Checking Expiration Oh, 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 Date:

Expiration Date If 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 Result Expiration date/time format

Delete Cache:

Delete Cache The 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:

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 cache:

How to use cache We 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. Create a page with header , body and footer content in a string. Write the header content to cache and set to expire in 3 minutes. Write the body content to cache and set to expire in 5 minutes. Write the footer content to cache and set to expire in 7 minutes . Add new content to each section of the page only after the content has expired.

API Reference:

API Reference For a better understanding of cache in ProdigyView , visit the api by clicking on the link below. PVCache More Tutorials For more tutorials, please visit: http:// /tutorials

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