need help! block requests when ( /administrator and not philippine ip address and not abc.com.ph)

i dont know if this is correct, but here is my irule

when HTTP_REQUEST { if { (!([HTTP::host] contains "abc.com.ph")) and ([HTTP::uri] starts_with "/administrator") and (!([whereis [IP::client_addr]] contains "Philippines")) } { drop } }

Can you suggest a better way to do it? thanks!