host=localhost not allowed in PHP to Postgres

[cfri]

PHP is not allowd to connect to Postgres "host=localhost", but if i remove the host entry it works, but most php projects expect a host name.

I'm guessing the pg_hba.conf file for Postgres needs something like:
"host all all 127.0.0.1 0.0.0.0 password"

Does anyone know if I should use a different host name?