How to optimize performance with PHP caching

With the rapid development of the Internet, PHP has become one of the most popular back-end programming languages, and more and more websites are using PHP. However, because of PHP's simple coding and easy-to-use characteristics, developers often develop without understanding its basic principles. These developers sometimes ignore performance issues, resulting in many performance issues.

As a well-known fact, the speed and performance of web pages directly affect user experience. For a website with high traffic, even small performance issues will affect user experience and SEO rankings. For these reasons, PHP caching is widely used to optimize PHP performance. In this article, we will introduce how to use PHP caching to optimize performance.

What is PHP cache?

In PHP, directive interpretation of each script file is a time-consuming process. This file is parsed for each request to generate the corresponding HTML page. By using caching mechanisms, instruction interpretation time can be reduced, thereby improving the performance of PHP applications.

PHP cache is a memory caching technology that can save the results of PHP script interpretation in memory to prevent the same data from being calculated multiple times. This can effectively reduce dependence on the PHP interpreter and improve the performance of PHP applications.

How to enable PHP cache?

There are many PHP caching technologies, the most popular of which are APC (Apache Panel Cache) and OPcache. The following will briefly introduce how to enable these two caching technologies on Linux systems:

Enable APC caching:

1. Install APC and enter the command

sudo apt-get install php-apc

2. Restart the Web server, enter the command

sudo /etc/init.d/apache2 restart

3. Check whether APC is working properly and create a PHP file:

<?php
phpinfo();
?>

Results returned by phpinfo() Do you see the APC module in .

Enable OPcache cache:

1. Install OPcache, enter the command

sudo apt-get install php-opcache

2. Restart the Web server, enter the command

sudo /etc/init.d/apache2 restart

3. Check whether OPcache is working properly and create a PHP file:

<?php
phpinfo();
?>

Whether you see the opcache module in the results returned by phpinfo().

Using PHP cache and performing benchmark tests

After completing the configuration and enabling of the cache, we need to test whether the cache can be used correctly. The following is a basic test method showing how to perform benchmarks using cache.

1. Create two PHP files named test.php and testcache.php respectively. The code of the test.php file is as follows:

<?php
// Get start time
$start = microtime(true);

// … Do all PHP code here …

// Get end time
$end = microtime(true);

// Print execution time
echo "Execution time: " . ($end - $start) . " seconds.";
?>

The code of the testcache.php file is as follows:

<?php
$cache_file = "/tmp/test.cache";
if (file_exists($cache_file) && time() - filemtime($cache_file) < 3600)
{
    echo file_get_contents($cache_file);
}
else
{
    ob_start();
    // … Do all PHP code here …

    $content = ob_get_contents();
    ob_end_clean();

    file_put_contents($cache_file, $content);
    echo $content;
}
?>

2. Now, access the two above PHP files and perform execution time Comparison:

http://your_domain.com/test.php
http://your_domain.com/testcache.php

3. The execution results will be displayed in your browser window. You can compare the execution time with and without caching to confirm whether caching can be effectively optimized. performance.

Conclusion

In this article, we covered how to optimize performance by using PHP caching. While this is just one of many ways to optimize PHP performance, it is a viable solution. If your website is highly trafficked and you are looking for a simple, fast solution to improve PHP performance, then using PHP caching is a very smart choice.

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