<?php

   $host        = "host=xx.xx.xx.xx";

   $port        = "port=5432";

   $dbname      = "dbname=nomedabasededados";

   $credentials = "user=postgres password=senha";

   $db = pg_connect( "$host $port $dbname $credentials"  );

   if(!$db){
      echo "Error : Unable to open databasen";
   }

 $sql = pg_query("INSERT INTO tabela (coluna1) VALUES ('valordacoluna1');");

?>