September 29, 2023


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The way to Set up a PHP Cache Utility

5 min read

If you’re creating an internet site utilizing PHP, you might have observed that it may grow to be fairly sluggish as your codebase grows. That is the place PHP caching is useful, as it may velocity up your web site’s load time by caching ceaselessly used knowledge and code. On this article, we’ll stroll you thru the method of putting in the APC PHP cache utility in your server.

What’s APC cache utility?

APC (Different PHP Cache) is a well-liked open-source caching framework for PHP net functions. It’s a free, light-weight and extremely environment friendly caching instrument that helps velocity up PHP efficiency by caching and optimising PHP bytecode.

APC works by storing compiled PHP code in shared reminiscence, which implies that as soon as the code has been cached, it may be accessed extra shortly than if it had been recompiled each time it’s requested. APC may cache variables, database outcomes and different knowledge that can be utilized repeatedly all through a PHP software.

Along with dashing up PHP efficiency, APC additionally reduces server load and improves scalability. By decreasing the period of time it takes for PHP to generate pages, APC permits net servers to deal with extra requests per second, which implies that servers can deal with extra site visitors with out slowing down or crashing.

The way to set up the APC cache utility

Step 1: Verify if APC is put in in your server

Earlier than putting in APC, you need to first test whether or not it’s already put in in your server. You are able to do this by working the next command within the terminal:

php -m | grep apc

If APC is put in, it is going to be listed within the output.

Step 2: Set up APC

If APC is just not put in in your server, you will want to put in it. To do that, you will want to have root entry to your server. You’ll be able to set up APC utilizing the next instructions within the terminal:

sudo apt-get replace sudo apt-get set up php-apc

Step 3: Configure APC

After putting in APC, you will want to configure it. You are able to do this by enhancing the php.ini file. The situation of this file could fluctuate relying in your server configuration, however it’s normally situated in /and so forth/php/apache2/php.ini.

Open the php.ini file in a textual content editor and add the next strains on the finish of the file:

apc.enabled=1 apc.shm_segments=1 apc.shm_size=64M apc.ttl=7200 apc.user_ttl=7200 apc.gc_ttl=3600 apc.stat=1

Save the modifications and shut the file.

Word: The APC cache utility has a number of configuration settings that may be customised to optimise its efficiency to your particular software. Listed here are a few of the most vital configuration settings for APC cache:

  1. apc.enabled – This setting determines whether or not APC cache is enabled or disabled. By default, it’s set to “1” which suggests APC cache is enabled.
  2. apc.shm_size – This setting specifies the quantity of reminiscence allotted for APC cache. The default worth is 32MB, however you possibly can enhance this worth relying in your software’s wants.
  3. apc.ttl – This setting determines the utmost time that an merchandise might be saved within the cache earlier than it’s thought-about stale and eliminated. The default worth is 0, which implies that objects are saved within the cache indefinitely.
  4. apc.user_ttl – This setting is much like apc.ttl, however it applies solely to objects which can be saved with the consumer cache API.
  5. apc.gc_ttl – This setting specifies how ceaselessly the APC cache rubbish collector runs. The default worth is 600 seconds (10 minutes).
  6. apc.mmap_file_mask – This setting specifies the file permissions for the shared reminiscence phase utilized by APC cache. The default worth is “/tmp/apc.XXXXXX”, the place “XXXXXX” is a random string of characters.
  7. apc.include_once_override – This setting determines whether or not or not APC cache ought to override PHP’s built-in include_once() operate. By default, that is set to “0” which implies that the built-in operate is used.
  8. apc.stat – This setting determines whether or not or not APC cache checks for file modifications each time a script is executed. If this setting is about to “1”, APC cache will test for modifications and re-cache recordsdata if needed.
  9. apc.num_files_hint – This setting specifies the variety of recordsdata that APC cache ought to count on to cache. That is used to optimize reminiscence allocation. The default worth is 1000.
  10. apc.file_update_protection – This setting specifies the minimal time (in seconds) that should move earlier than APC cache will re-cache a file that has been modified. The default worth is 2 seconds.

These are simply a few of the many configuration settings accessible for APC cache. It’s vital to strive totally different values to search out the optimum configuration to your software.

Step 4: Restart Apache

After configuring APC, you will want to restart the Apache net server for the modifications to take impact. You are able to do this utilizing the next command within the terminal:

sudo service apache2 restart

Step 6: Take a look at APC

To check if APC is working, you possibly can create a PHP file with the next code:

<?php apc_add(‘take a look at’, ‘Good day World!’, 60); echo apc_fetch(‘take a look at’); ?>

Save the file as take a look at.php and add it to your server. Once you open the file in your net browser, it ought to show “Good day World!”.

Can I set up a PHP cache utility on shared internet hosting?

If in case you have shared internet hosting and should not have root entry to the server, then you definately won’t be able to put in a PHP cache utility. Nonetheless, at eukhost, our shared internet hosting plans, together with cPanel and WordPress internet hosting, include PHP caching already enabled. We do that by the usage of OPCache. OPCache makes use of shared reminiscence to retailer precompiled PHP scripts for quicker execution.


On this article, now we have proven you easy methods to set up APC, a PHP cache utility, in your server. By caching ceaselessly used knowledge and code, APC can velocity up your web site’s load time, making it extra responsive and bettering the consumer expertise.

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