  A large number of new experimental data on $B$ decay into two light
pesudoscalar ($P$) mesons have been collected by the LHCb collaboration.
Besides confirming information on $B_{u,d} \to PP$ decays obtained earlier by
B-factories at KEK and SLAC, new information on $B_s\to PP$ and also more decay
modes with $P$ being $\eta$ or $\eta'$ have been obtained. Using these new
data, we perform a global fit for $B \to PP$ to determine decay amplitudes in
the framework of $SU(3)/U(3)$ flavor symmetry. We find that $SU(3)$ flavor
symmetry can explain data well. The annihilation amplitudes are found to be
small as expected. Several CP violating relations predicted by $SU(3)$ flavor
symmetry are in good agreement with data. Current available data can give
constraints on the amplitudes which induce $P = \eta,\;\eta'$ decays in the
framework of $U(3)$ flavor symmetry, and can also determine the $\eta-\eta'$
mixing angle $\theta$ with $\theta = (-18.4\pm1.2)^\circ$. Several $B \to PP$
decay modes which have not been measured are predicted with branching ratios
accessible at the LHCb. These decays can provide further tests for the
framework of $SU(3)/U(3)$ flavor symmetry for $B$ decays.
