Php – How to build/install calendar.so for php

What is your php.ini extension_dir set to?

In our case, pecl installs extensions to /usr/local/lib/php/ext/no-debug-non-zts-20060613, but the extension_dir ini setting is either "./" or "/usr/local/lib/php/ext". The output of the pecl install should have told you where it installed the extension, so you'll just need to change your extension_dir to match or move the fileinfo.so file to the directory specified in php.ini.

Your "_asm" refers to inline assembly language embedded in the C code.

"Inline assembly is not supported on the Itanium and x64 processors," per http://msdn.microsoft.com/en-us/library/4ks26t93(VS.80).aspx.

Therefore, you cannot simply recompile it; you would have to rework the code to remove the inline assembly code and replace it with C-language instructions. Not only would this be a lot of work, but it probably would undo the performance optimizations that were implemented using the inline assembly code. There's probably a way to use a separate assembler to build the assembly-language portions and then link them into the project, but that obviously would be light-years beyond our sysadmin realm.

I suspect that this is the reason why there is no official 64-bit build of PHP for Windows. I have heard of unofficial 64-bit Windows builds of PHP, but they are reputed to be unstable.

Have you considered setting up a separate 32-bit application pool specifically for PHP? That would enable you to run PHP in 32-bit compatibility mode without breaking your 64-bit ASP.NET applications.