How to choose between PHP version Non Thread Safe and Thread Safe? What's the difference?

PHP versions are divided into Non Thread Safe and Thread Safe. Non Thread Safe refers to non-thread safety, and Thread Safe refers to thread safety. What is the difference? how to choose?

The difference between Non Thread Safe and Thread Safe

• ts(Thread-Safety) That is, Thread safety. When accessed by multiple threads, a locking mechanism is adopted. When a thread accesses certain data of this class, it is protected and other threads cannot access it until the thread finishes reading. , other threads can use it. There will be no data inconsistency or data pollution. Select this version when php is loaded in ISAPI mode. Select this version when php is loaded in ISAPI mode.

• nts(None- Thread Safe)That is, non-thread safety, that is, it does not provide data access protection. It is possible that multiple threads change the data one after another, resulting in dirty data. Select this when php is running in fast cgi mode. version, with better performance;

• ISAPI (Internet Server Application Programming Interface), usually refers to being loaded by the http server and running in the form of a server module , proposed by Microsoft, so it can only run on the win platform, such as apache and iis under win [it is said that fast cgi works more stably], while php on Linux runs in the Apache module or php-fpm.

• cgi(Common Gateway Interface): A tool for the HTTP server to "talk" to your program or that of other machines. To put it bluntly, cgi is A backend language that communicates with the server. At this time, php is running as an independent program. The characteristic is that it consumes memory.

• fast cgi. is a long-live CGI. It can be executed all the time. As long as it is activated, it will not need to be executed every time. It takes time to fork. This method is a language-independent, scalable architecture CGI open extension. Its main behavior is to keep the CGI interpreter process in memory and therefore obtain higher performance.

ISAPI execution method is used in the form of a DLL dynamic library, which can be executed after being requested by the user. It will not disappear immediately after processing a user request, so thread safety checks are required. , this will improve the execution efficiency of the program, so if you are using ISAPI to execute PHP, it is recommended to choose the ThreadSafe version .

The FastCGI execution method uses a single thread to perform operations, so there is no need to perform thread safety checks. Removing the protection of thread safety checks can improve execution efficiency, so if FastCGI is used to execute PHP, It is recommended to choose the NonThread Safe version.

So, how to check whether the current PHP is Non Thread Safe (non-thread safe) or Thread Safe (thread safe)?

is very simple. Print phpinfo() and check the Thread Safety option in the PHP version information. This option is enable, which is Thread Safe (thread safe) version, otherwise None Thread Safe (non-thread safe) version.

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