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LAMP stands for Linux,Apache,Mysql and PHP

All of those are open source resource and free to download.
Security of linux is very high more than windows.
Apache is a better server than IIS both in functionality and security.
Mysql is world most popular open source database.
Php is more faster than asp or any other scripting language.
MySQL is used by high traffic websites some are Wikipedia, Google (though not for searches), Facebook and Twitter etc. widely used LAMP web application software stack

Probably one server has a 64 bit processor. The GetInt4d bit shift doesn't work with 64 bit processors.

Andreas Rehm hacked it to ensure correct result of the <<24 block on 32 and 64bit systems, just replace the code of the GetInt4d function with the following:

$_or_24 = ord($data[$pos+3]);

if ($_or_24>=128)
$_ord_24 = -abs((256-$_or_24) << 24);
else
$_ord_24 = ($_or_24&127) << 24;

return ord($data[$pos]) | (ord($data[$pos+1]) << 8) | (ord($data[$pos+2]) << 16) | $_ord_24;