If you run /script/php53s-installer, Kloxo-MR will be installing php53s. Char 's' is 'special' that mean Kloxo-MR using their 'special' php (already have php52s and php53s).
But, if you run /script/php53m-installer, Kloxo-MR will be installing php53u/php53.
All files will be appear in /opt directory.
Installing phpXXm with special trick (not use 'yum install' but 'yumdownloader; rpm2cpio | cpio -idmv'). Read '/script/phpm-installer' script for what's I mean.
With 'yum install', only possible 1 php installed and running. But, with special trick possible install multiple php and running together (as target for multi-php in Kloxo-MR).