The postgres SQL code for listing table names is:

select relname from pg_stat_user_tables order by relname


The PHP code to for listing table names is:

$sHost = 'localhost';
$sDatabase = 'aaaa';
$sUser = 'bbbb';
$sPassword = 'cccc';

$conn = pg_connect("host=$sHost dbname=$sDatabase user=$sUser password=$sPassword") 
          or die('unable to connect to database');
$q = 'select relname from pg_stat_user_tables order by relname';
$result = pg_query($conn, $q) or die ("Error in query: $q - " . pg_last_error($q));        

while ($rw = pg_fetch_array($result)) {
    print $rw[0] . '<br>';
}