PHP 7 performance optimization tips: How to use opcache to speed up script execution

PHP 7 performance optimization tips: How to use opcache to speed up script execution

Introduction:
PHP is a widely used server-side scripting language. Its flexibility and ease of use make it a The first choice for building dynamic web pages and applications. However, PHP's performance can become a bottleneck when handling a large number of concurrent requests. In order to solve this problem, we can use opcache to speed up the execution of scripts, thus improving the performance of PHP.

What is opcache?
Opcache is a built-in extension of PHP that is used to cache and precompile PHP scripts so that the cached scripts can be used directly in subsequent requests without the need to reload them every time. Reparse and compile source code. This can greatly reduce the time of parsing and compilation, thereby improving the execution speed of the script.

How to enable opcache?
Enabling opcache is very simple, you only need to make some configurations in the php.ini file. First, locate the php.ini file and open it using a text editor. Then search for opcache-related configuration items, which usually start with [opcache]. According to your needs, adjust the following configuration items:

opcache.enable=1
opcache.memory_consumption=128
opcache.max_accelerated_files=5000
opcache.revalidate_freq=60

opcache.enable: Set to 1 to enable opcache, and set to 0 to disable opcache.
opcache.memory_consumption: Set the memory size used by opcache, in MB. Depending on your server configuration and needs, this value can be adjusted.
opcache.max_accelerated_files: Set the number of scripts cached by opcache. You can adjust this value appropriately based on the size of your application.
opcache.revalidate_freq: Set the script verification frequency of opcache cache, in seconds.

After the configuration is completed, save and close the php.ini file, and restart your web server to make the configuration take effect.

Use opcache to detect performance improvement:
After completing the configuration of opcache, we can use some tools to detect the effect of performance improvement. A commonly used tool is the opcache status page. This page can display the status and statistical information of opcache, including cache hit rate, memory usage, etc.

The following is an example of a simple opcache status page:

$opcache_status = opcache_get_status();

echo "

" ;<br>print_r($opcache_status);<br>echo "

";

?>

Save the above code as a php file, and then open it in the browser By accessing this file, you can see the status and statistical information of opcache. Based on this information, you can understand the usage of opcache and the effect of performance improvement.

Other notes:
Although opcache can significantly improve the performance of PHP, there are some other notes to consider:

1. Version compatibility: Make sure your PHP The version is compatible with opcache. Different PHP versions may have different opcache versions, so check the corresponding documentation and guides carefully.
2. Adjust parameters: The configuration parameters of opcache can affect the performance improvement effect, so they should be adjusted according to your own needs. You can make corresponding adjustments based on the information on the opcache status page.
3. Memory limit: opcache uses memory to cache scripts, so the server's memory limit should be taken into account when configuring opcache. If your server has small memory, you may need to adjust the memory configuration parameters of opcache.

Conclusion:
By using opcache as a performance optimization tool for PHP, we can significantly improve the execution speed of the script and reduce the load on the server. Understanding the configuration and usage of opcache can help us better optimize the performance of PHP applications.

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