codeguy/php-the-right-way — pull request #236 by coreymcmahon (2013-01-09 07:07:40+00:00)
Title: Added singleton pattern to the Design-Patterns page

One of the most obvious (and frequently used) patterns in PHP.

May have been intentionally omitted as some developers consider it bad practice to use the singleton pattern. Regardless, it's commonly used so it makes sense to describe it.