Change background color of a page using php

Question

I have a standard html page so:

..
.
..
and so on

and i have a php script linked to that html page with:

Answer 1

It's not necessarily great practice, but it should get the job done:

if ( your_conditional ) {
  $styleBlock = sprintf('
    
  ', $yourColor);
  echo $styleBlock;
}

One good (?) thing about this is that with this technique, you can put your if statement anywhere - it'll act on the body tag regardless of where you put it.

One caution: if you have additional style rules for the body tag's background color farther down your page, those will take precedence over the one from your if statement.