  In this paper, we introduce a homological notion of left
$\phi$-biprojectivity for Banach algebras, where $\phi$ is a non-zero
multiplicative linear functional. We show that for a locally compact group $G$,
the Segal algebra $S(G)$ is left $\phi$-contractible if and only if $G$ is
compact. Also, we prove that the Fourier algebra $A(G)$ is left
$\phi$-biprojective if and only if $G$ is discrete. Finally, we study left
$\phi$-biprojectivity of certain semigroup algebras. We give some examples
which show the differences between our new notion and the classical ones.
