If you're feeling ambitious, you could write an ObjectPascal interpreter that runs on Apache and acts similar to php.
The challenge with that is there are elements in Delphi that have syntax and semantics that only apply to compiled code. An interpreted version of Delphi would need to be a little different.
TMS Software has an interpreter that supports both BASIC and ObjectPascal syntax that you could probably use as a base for something.
There's also DWScript, as was mentioned earlier.
The problem with apps like WP and Drupal is they have not been written (historically speaking) in a very object-oriented manner, due to a bias lots of php coders have against OOP, believing it slows down execution time. Last I checked, Python was much slower than php (and fully OOP), yet it's use is growing extremely fast, so I guess execution speed is more of a religious issue than anything else.
Then you've got all of the weird ways people do things OOP-wise with php code that would make most serious Delphi, C++, and C# coders gag.