How to use PHP7.0 for performance optimization?

In the context of the current rapid development of the Internet, website performance has always been a very critical topic. How to make our website faster and smoother is the goal pursued by many web developers. At the same time, PHP, as a widely used server-side language, also faces optimization challenges. This article will introduce how to use PHP7.0 for performance optimization.

1. Update to PHP7.0
As the latest version of PHP, PHP7.0 provides higher performance and more optimizations. Simply updating your PHP version to PHP 7.0 can give your website instant better performance. PHP7.0 has improved performance by 30% to 50% compared to PHP 5.x, and it can support more concurrent connections.

2. Use the PHP caching mechanism
The PHP caching mechanism can minimize repeated calculations and queries, thereby greatly improving the performance of PHP. There are many PHP caching mechanisms available, such as APC, Memcache and OpCache. In PHP7.0, OpCache is integrated into the PHP core, allowing applications to run faster. Using the OpCache configuration of PHP7.0 can achieve better performance.

3. Optimize OpCache
OpCache performance optimization can be achieved through two aspects, one is to provide it with enough memory, and the other is to set the correct options for it. OpCache can be set by modifying the php.ini file, and the following parameters can be modified:

• opcache.memory_consumption, used to set the amount of memory used by OpCache.

• opcache.max_accelerated_files, used to set the upper limit of the number of files that OpCache can cache.

• opcache.revalidate_freq, used to set the frequency (unit: seconds) that OpCache automatically checks for file modifications when requesting new files.

Proper configuration can enable OpCache to better utilize its performance advantages and improve the performance of PHP.

4. Avoid using eval
The eval() function can execute a string as a PHP script. This is a way to dynamically compile PHP code, but it will reduce the performance of PHP. In PHP7.0, the use of eval has been restricted and is no longer recommended. Using other methods, such as using functions to convert strings into PHP code and executing them in the program, can improve PHP performance.

5. Using the error logger
In PHP7.0, a new feature is introduced, the error logger. Using the error logger, you can capture more error information while PHP is running and save it to the error log. This feature allows us to find and solve problems faster and improve the performance and reliability of PHP.

6. Use redis to cache data
Redis is a non-relational database that can help us store data and is very fast. When we need to cache some complex data structures, using redis can help us improve the performance of PHP. In PHP7.0, redis has become the default PHP extension. Using redis, you can put some frequently accessed data into the cache, improve the performance of PHP, and reduce the request operations to the database.

7. Use high-performance frameworks
Using high-performance frameworks is one of the effective means to optimize the performance of PHP applications. In the world of PHP7.0, some high-performance frameworks continue to appear, such as Laravel, Symfony, etc. These frameworks themselves have certain caching functions, and since they are all written in accordance with the latest PHP7.0, they can also take full advantage of the performance improvements of PHP7.0.

Summary
Optimizing the above seven aspects can greatly improve the performance of PHP. Of course, there are many other aspects that require our attention and optimization, such as database query optimization, code structure optimization, etc. These are also effective means to improve PHP performance. In actual development, we need to continuously learn and explore, and make our PHP applications more smooth and efficient through continuous optimization.

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