Parsing the difference between VC6 X86 and VC9 X86 in PHP and Non Thread safe's meaning _php tutorial

PHP is now available in version 5.3.0, but there are several different versions to choose from when downloading. That's VC6 X86 and VC9 X86.
First I will answer:

What is VC6?
VC6 is Legacy Visual Studio 6 compiler, which is compiled with this compiler.

What is VC9?
VC9 is the Visual Studio 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, please select the VC6 version;
If you are using iis+php under Windows, please select the VC9 version;

What is the non Thread safe?
Non thread safe is non-threaded;

What is Thread Safe?
thread safe is threaded;
The official does not recommend that you apply the non thread safe to the production environment, so we chose the thread safe version of PHP to use.
PHP download page: http://windows.php.net/download/

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