Summary of 5 php7 performance optimization tips
PHP7 has been released. As the largest version upgrade and the largest performance upgrade of PHP in 10 years, PHP7 has shown obvious performance improvements in multiple tests. However, in order for it to maximize its Performance, there are still a few things I would like to remind you.
1. Opcache
## Remember to enable Zend Opcache, because PHP7 is faster even if Opcache is not enabled than PHP-5.6 with Opcache enabled, so some people did not enable Opcache during the previous testing period. Enabling Opcache is very simple, configure it in php.iniAdd to file :
zend_extension=opcache.so opcache.enable=1 opcache.enable_cli=1"
2. Use a new compiler
Use a newer compiler, GCC 4.8 or above is recommended, because only GCC 4.8 or above PHP will enable Global Register for opline and execute_data support, which will bring about a 5% performance improvement (measured from the QPS perspective of Wordpres)In fact, versions before GCC 4.8 also support it, but we found that it supports There is a bug, so it must be version 4.8 or above to enable this feature.3. HugePage
I also introduced it in my previous article: Make your PHP7 more To quickly use Hugepage, first enable HugePages in the system, and then enable Opcache's huge_code_pages.Take my CentOS 6.5 as an example, pass:$sudo sysctl vm.nr_hugepages=512Allocate 512 reserved large page memory:
$ cat /proc/meminfo | grep Huge AnonHugePages: 106496 kB HugePages_Total: 512 HugePages_Free: 504 HugePages_Rsvd: 27 HugePages_Surp: 0 Hugepagesize: 2048 kBThen add in php.ini:
opcache.huge_code_pages=1In this way, PHP will allocate its own text segment and memory Huges in are stored in large memory pages to reduce TLB misses and improve performance.
4. Opcache file cache
Enable Opcache File Cache (experimental), by turning this on, we can let Opcache cache opcodecache into an external file. For some scripts, there will be a significant performance improvement.In php.ini Add:
opcache.file_cache=/tmpso that PHP will cache some Opcode binary export files in the /tmp directory, which can exist across the PHP
life cycle.
5. PGO
My previous article: Make your PHP7 faster (GCC PGO) also introduced that if your PHP is specifically for one project, such as just for your WordPress, or drupal, Or something else, then you can try to improve PHP through PGO, specifically to improve the performance of your project. Specifically, take WordPress 4.1 as the optimization scenario. First, when compiling PHP:$ make prof-genThen use your project to train PHP, for example, for WordPress:
$ sapi/cgi/php-cgi -T 100 /home/huixinchen/local/www/htdocs/wordpress/index.php >/dev/nullThat is, let php-cgi run 100 times on the WordPress homepage to generate some profile information in the process. Finally:
$ make prof-clean $ make prof-use && make installThe PHP7 you compile at this time is the highest performance compiled version tailored for your project.
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Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

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Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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