October 1, 2023


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Tips on how to Set up a PHP Cache Utility

5 min read

If you’re growing a web site utilizing PHP, you will have seen that it may well change into fairly sluggish as your codebase grows. That is the place PHP caching turns out to be useful, as it may well velocity up your web site’s load time by caching steadily used knowledge and code. On this article, we are going to 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 purposes. It’s a free, light-weight and extremely environment friendly caching software that helps velocity up PHP efficiency by caching and optimising PHP bytecode.

APC works by storing compiled PHP code in shared reminiscence, which signifies that as soon as the code has been cached, it may be accessed extra rapidly than if it have 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 utility.

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

Tips on how to set up the APC cache utility

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

Earlier than putting in APC, it is best to first examine whether or not it’s already put in in your server. You are able to do this by operating the next command within the terminal:

php -m | grep apc

If APC is put in, it will likely be listed within the output.

Step 2: Set up APC

If APC is just not put in in your server, you have to to put in it. To do that, you have to to have root entry to your server. You possibly can 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 have to to configure it. You are able to do this by modifying the php.ini file. The situation of this file might fluctuate relying in your server configuration, however it’s normally positioned in /and so on/php/apache2/php.ini.

Open the php.ini file in a textual content editor and add the next traces 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.

Observe: The APC cache utility has a number of configuration settings that may be customised to optimise its efficiency to your particular utility. Listed below are among the most essential 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 implies 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’ll be able to enhance this worth relying in your utility’s wants.
  3. apc.ttl – This setting determines the utmost time that an merchandise could be saved within the cache earlier than it’s thought-about stale and eliminated. The default worth is 0, which signifies that gadgets are saved within the cache indefinitely.
  4. apc.user_ttl – This setting is much like apc.ttl, but it surely applies solely to gadgets which are saved with the consumer cache API.
  5. apc.gc_ttl – This setting specifies how steadily 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 section 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() perform. By default, that is set to “0” which signifies that the built-in perform 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 examine for modifications and re-cache recordsdata if crucial.
  9. apc.num_files_hint – This setting specifies the variety of recordsdata that APC cache ought to anticipate 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 cross earlier than APC cache will re-cache a file that has been modified. The default worth is 2 seconds.

These are simply among the many configuration settings accessible for APC cache. It’s essential to attempt completely different values to search out the optimum configuration to your utility.

Step 4: Restart Apache

After configuring APC, you have to 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’ll be able to create a PHP file with the next code:

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

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

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

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


On this article, we’ve got proven you find out how to set up APC, a PHP cache utility, in your server. By caching steadily 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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