Support Postgres 15 and beyond

[Steveorevo]

Doesn't seem to work with Postgres 15, a default to the case statement seems to resolve this and may address future major incompatibilities.

[ReimuHakurei]

This is actually a bug from the intended behavior (intended behavior has always been to default to the latest driver for an unknown PostgreSQL version).

The problem is with the check to make sure PostgreSQL is version 7.4 or newer -- it does this by checking the first digit of the version string and making sure it's >= 8 (7.4 and 7.5 were already handled further up in the function):

if ((int)substr($version, 0, 1) < 8)
	return null;

The problem is that with PostgreSQL 10+, the first digit is always 1, so this breaks for any version not specifically defined.

The proper fix is to replace that check with something like the following:

$floatVer = floatval(explode(' ', $version)[0]);
if ($floatVer < 7.4) {
	return null;
}

Note that this repository has been dead for several years now, so the chance someone will come to accept your PR at this point is probably close to zero, unfortunately.

You will find existing fixes for this issue and quite a few more in my fork if you want, though: https://github.com/ReimuHakurei/phpPgAdmin/releases