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If i had to guess, I would say no b/c the editor would have to be able to format HTML as well, since PHP is often embedded within HTML code - moreover, something like this (see below) may be difficult to figure out for the formatter - or the programmer creating the editor.
<? ($i!= '') echo "<th>" : echo "<td>"?>
<? ($i!= '') echo "</th>" : echo "</td>"?>
Again, this is just a guess.