Change PATH
array variable name to something different, like:
P=(
$HOME/bin
/usr/local/bin
/usr/bin
/bin
/usr/sbin/
/sbin
)
PATH=$(IFS=:; echo "${P[*]}")
export PATH
I'm not sure why, though. If I figure that out, I'll update this answer.
Update: for a little bit more info on this, see this topic.