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
Iis
If you want to use IIS to configure PHP, then you need to choose Non-thread Safe (NTS) version of PHP
Apache
If you are using the Apache version from Apache Lounge (website:http://apachelounge.com/), you can use PHP VC11 x86 or x64 version.
If you use the APACHE1 or Apache2 downloaded from apache.org to build the PHP environment, you can only use the VC6 version, not the vc9+ version.
VC9 and VC11
VC9 and VC11 are the latest versions of PHP (these two editions are compiled by Visual Studio 2008 and Visual Studio 2012, respectively), and include improvements to performance and stability.
The VC9 version requires users to install the Microsoft Visual C + + SP1 Redistributable Package (x86 | x64)
VC11 version requires users to install Visual C + + redistributable for Visual Studio (x86 | x64)
Httpd.exe what to do with missing Msvcr110.dll in your computer
Download and install, if you are not having it already, from:
http://www.microsoft.com/en-us/download/details.aspx?id=30679
The above describes the various VC9 VC11 version of Apache, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.