This is just kind-of low-power. Some microcontrollers (e.g. PICs) can have sleep consumptions measured in nanoamperes. Months to years on a coin cell... just, they would need an external wifi module, which is highly inconvenient.

Except that in a contemporary PHP that doesn't work any more.

  PHP Warning:  Uncaught Error: Undefined constant "flase" in php shell code:1

On what? I'd be curious to read more (documented sources)

Funny project...

Tried to run SHELL from QBASIC, but it crashes:

  D:\qbasic.exe has encountered a problem and needs to close.
  
  Reason:  illegal instruction
  Address: 0x00002fee

Sure but if you click on the "online one" you still have to skip two pages offering you to use the app instead. The same pages you see in the article.