The difference between VC6 X86 and VC9 X86 in PHP and the meaning of Non Thread Safe are analyzed

PHP is now available in 5.3.0, but there are several different versions available for download. That is VC6 X86 and VC9 X86.
First, Let me answer:

What is VC6?
VC6 is legacy Visual Studio 6 compiler, which is compiled using this compiler.

What is VC9?
VC9 is the Visual Studio 2008 compiler, which is compiled with Microsoft's VS editor.
So how do we choose which version of PHP to download?
If you are using Apache+PHP under windows, select VC6.
If you are using IIS+PHP under windows, select VC9.

So what is Non Thread Safe?
Non Thread Safe is non-thread-safe;

What is Thread Safe?
Thread Safe is thread safe;
It is not recommended that you use Non Thread Safe for production, so we chose Thread Safe version PHP.
php download page: http: / / windows php. net/download /