Can't connect to postgres database, what's the problem?

Question

PHP

On Linux Ubuntu Server 16.04(64-bit) web-server apache 2.2 postgres 9.5 php 7.2 and phppgadmin are installed and
so I connect to the database with this script:
<?php
$db=pg_connect ('host=localhost port=5432 dbname=base user =postgres password=1q2w3e ');
if(!db){
die ('Failed to connect to database');
}
?>
So I can't connect, although all the data is correct (I checked it with phppgadmin), I changed localhost to 127.0.0.1 and even to ip in the local network, nothing changes ..... tell me what could be...

Answer 1

why guess ?