A cache is a collection of duplicate data, where the original data is expensive to fetch or compute (usually in terms of access time) relative to the cache. In PHP, caching is used to minimize page generation time.
What does cache mean in-memory?
Computer cache definition
Cache is the temporary memory officially termed “CPU cache memory.” This chip-based feature of your computer lets you access some information more quickly than if you access it from your computer’s main hard drive.
What is cache memory with example?
Memory cache – When an application is running, it may cache certain data in the system memory, or RAM. … For example, if you are working on a video project, the video editor may load specific video clips and audio tracks from the hard drive into RAM.
How does PHP store data in cache?
The easiest is to serialize() the data and store it in your database. When you need to retrieve the database, query it from the database, unserialize() it, and use it as before. As second approach is to add memcache to your PHP installation and access your data via the memcache functions.
Does PHP have cache?
PHP by itself does not do caching. But there are opensource frameworks to let the programmer design their code to work this way. In other words, it lets the code check if the data has already been retrieved before it goes and fetches it again, which is a relatively slow process since it has to query the database.
Why do we use cache memory?
Cache memory in computer systems is used to improve system performance. Cache memory operates in the same way as RAM in that it is volatile. … cache memory stores instructions the processor may require next, which can then be retrieved faster than if they were held in RAM.
What are the 3 types of cache memory?
There is three types of cache:
- direct-mapped cache;
- fully associative cache;
- N-way-set-associative cache.
What is L1 L2 and L3 cache?
L1 is usually part of the CPU chip itself and is both the smallest and the fastest to access. Its size is often restricted to between 8 KB and 64 KB. L2 and L3 caches are bigger than L1. They are extra caches built between the CPU and the RAM. … The more L2 and L3 memory available, the faster a computer can run.
What is cache in simple terms?
Cache primarily refers to a thing that is hidden or stored somewhere, or to the place where it is hidden. It has recently taken on another common meaning, “short-term computer memory where information is stored for easy retrieval.” Cash, on the other hand, is most often used in the sense “ready money.”
What are types of cache memory?
There are two different types of cache memory: primary and secondary. Primary cache memory is found on the CPU itself whereas secondary cache memory is found on a separate chip close to the CPU. Although, as time has progressed, the secondary cache has become rather obsolete as most caches are found on the CPU.
Where is PHP cache stored?
Your application’s cache configuration file is located at config/cache. php . In this file, you may specify which cache driver you would like to be used by default throughout your application.
How do I cache in PHP?
If the defined lifetime is exceeded, the server will execute the PHP script and subsequently generate a new cached version of it.
- Step One: Create The top-cache. php File. …
- Step Two: Create The bottom-cache. php File. …
- Step Three: Include Cache Files On Your Page.
What does PHP artisan config cache do?
To give your application a speed boost, you should cache all of your configuration files into a single file using the config:cache Artisan command. This will combine all of the configuration options for your application into a single file which can be quickly loaded by the framework.
How do I clean my cache?
In the Chrome app
- On your Android phone or tablet, open the Chrome app .
- At the top right, tap More .
- Tap History. Clear browsing data.
- At the top, choose a time range. To delete everything, select All time.
- Next to “Cookies and site data” and “Cached images and files,” check the boxes.
- Tap Clear data.
How do I clear my composer cache?
Or to just clear one or a few packages: $ composer clearcache packagename1 packagename2 … You can also use clear-cache which is an alias for clearcache .
How do I flush PHP cache?
As a PHP developer
You can call the apc_clear_cache() function to clear the cache. To clear the user cache (key/value), you can use apc_cache_clear(‘user’) . To clear the system cache, the one that holds the byte-code of the PHP files (the so called “opcode” cache), just call apc_cache_clear() without options.