hi!
i noticed a problem with nested if...then...else s
Example:

if ($A==1):
  if ($B==2) DoThis();
  if ($C==3) DoThat();
else:
  DoSomething;
endif;

in this case - the 'else:' on thr 4th line is regarded as an 'else' continuing from the 'if' on the 3rd line.
this generates a parser error.
this may cause confusion to some of you (it did to me) but the workaround is this:

if ($A==1) {
  if ($B==2) DoThis();
  if ($C==3) DoThat();
} else {
  DoSomething;
}