LAMP originated with 'PHP' as the 'P'. It's also by far the most common, for better or worse; 1.4M hits for 'linux apache mysql php' versus 50k for 'linux apache mysql perl' on Google.
"Of course, there are plenty of excellent open source variants for any of the pieces of LAMP. Let the L stand for Linux, FreeBSD, NetBSD, OpenBSD, and Darwin/Mac OS X, all of which are open source operating systems and all but the latter have open source GUI layers. Let the M stand for MySQL and PostGreSQL. Let the P stand for PHP, Perl, Python, and Ruby."
LAMP originated with 'PHP' as the 'P'. It's also by far the most common, for better or worse; 1.4M hits for 'linux apache mysql php' versus 50k for 'linux apache mysql perl' on Google.