1． The difference between VC6 and VC9:
The VC6 version is compiled using the Visual Studio 6 compiler. If your PHP is built using Apache, then you should choose the VC6 version.
The VC9 version is compiled using the Visual Studio 2008 compiler. If your PHP is set up using IIS, then you should choose the VC9 version.
The VC9 version is for the IIS server and does not support APACHE, while the VC6 version provides support for both IIS and Apache
2. The difference between Ts and nts:
The Windows version of PHP has Thread Safe and NoneThread Safe starting from version 5.2.1.
First understand from the literal meaning, Thread Safe is thread safety, and thread (Thread) safety check will be performed during execution to prevent CGI execution from starting new threads when there are new requirements and exhausting system resources. Non Thread Safe is non-thread safe and does not perform thread (Thread) safety checks during execution.
3. There are two execution methods of PHP: ISAPI and FastCGI.
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 to 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 you are using FastCGI to execute PHP, it is recommended to choose the NonThread Safe version. Check the Thread Safety item through phpinfo();. This item is to check whether it is thread safe. If it is: enabled, generally speaking it should be the ts version, otherwise it is the nts version.
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