Description:
------------
The regular expressions used in pg_convert for several data types reject many different valid values. As the test script below demonstrates:

- For cidr and inet only IPv6 addresses without network mask are accepted, so networks and IPv4 are not supported.
- For date and time (and timestamp) only a subset of ISO 8601 formatted strings are accepted.
- For intervals only verbose syntax is accepted.

The changelog of the function (http://php.net/pg_convert) states that 'unknown/unsupported data types are escaped without validation'. Maybe a better approach is to not validate these data types too and just escape them.

Test script:
---------------
$db = pg_connect('dbname=foo');
pg_query($db, 'create table test (_inet inet, _cidr cidr, _date date, _time time, _interval interval)');
error_reporting(0);
print_r(pg_convert($db, 'test', ['_inet'=>'192.168.100.128/25']));
print_r(pg_convert($db, 'test', ['_inet'=>'192.168/24']));
print_r(pg_convert($db, 'test', ['_inet'=>'192.168/25']));
print_r(pg_convert($db, 'test', ['_inet'=>'192.168.1']));
print_r(pg_convert($db, 'test', ['_inet'=>'192168']));
print_r(pg_convert($db, 'test', ['_inet'=>'128.1']));
print_r(pg_convert($db, 'test', ['_inet'=>'128']));
print_r(pg_convert($db, 'test', ['_inet'=>'128.1.2']));
print_r(pg_convert($db, 'test', ['_inet'=>'10.1.2']));
print_r(pg_convert($db, 'test', ['_inet'=>'10.1']));
print_r(pg_convert($db, 'test', ['_inet'=>'10']));
print_r(pg_convert($db, 'test', ['_inet'=>'10.1.2.3/32']));
print_r(pg_convert($db, 'test', ['_inet'=>'2001:4f8:3:ba::/64']));
print_r(pg_convert($db, 'test', ['_inet'=>'2001:4f8:3:ba:2e0:81ff:fe22:d1f1/128']));
print_r(pg_convert($db, 'test', ['_inet'=>'2001:4f8:3:ba:2e0:81ff:fe22:d1f1']));
print_r(pg_convert($db, 'test', ['_cidr'=>'192.168.100.128/25']));
print_r(pg_convert($db, 'test', ['_cidr'=>'192.168/24']));
print_r(pg_convert($db, 'test', ['_cidr'=>'192.168/25']));
print_r(pg_convert($db, 'test', ['_cidr'=>'192.168.1']));
print_r(pg_convert($db, 'test', ['_cidr'=>'192168']));
print_r(pg_convert($db, 'test', ['_cidr'=>'128.1']));
print_r(pg_convert($db, 'test', ['_cidr'=>'128']));
print_r(pg_convert($db, 'test', ['_cidr'=>'128.1.2']));
print_r(pg_convert($db, 'test', ['_cidr'=>'10.1.2']));
print_r(pg_convert($db, 'test', ['_cidr'=>'10.1']));
print_r(pg_convert($db, 'test', ['_cidr'=>'10']));
print_r(pg_convert($db, 'test', ['_cidr'=>'10.1.2.3/32']));
print_r(pg_convert($db, 'test', ['_cidr'=>'2001:4f8:3:ba::/64']));
print_r(pg_convert($db, 'test', ['_cidr'=>'2001:4f8:3:ba:2e0:81ff:fe22:d1f1/128']));
print_r(pg_convert($db, 'test', ['_cidr'=>'2001:4f8:3:ba:2e0:81ff:fe22:d1f1']));
print_r(pg_convert($db, 'test', ['_date'=>'1999-01-08']));
print_r(pg_convert($db, 'test', ['_date'=>'January 8, 1999']));
print_r(pg_convert($db, 'test', ['_date'=>'1/8/1999']));
print_r(pg_convert($db, 'test', ['_date'=>'1/18/1999']));
print_r(pg_convert($db, 'test', ['_date'=>'01/02/03']));
print_r(pg_convert($db, 'test', ['_date'=>'1999-Jan-08']));
print_r(pg_convert($db, 'test', ['_date'=>'Jan-08-1999']));
print_r(pg_convert($db, 'test', ['_date'=>'08-Jan-1999']));
print_r(pg_convert($db, 'test', ['_date'=>'99-Jan-08']));
print_r(pg_convert($db, 'test', ['_date'=>'08-Jan-99']));
print_r(pg_convert($db, 'test', ['_date'=>'Jan-08-99']));
print_r(pg_convert($db, 'test', ['_date'=>'19990108']));
print_r(pg_convert($db, 'test', ['_date'=>'990108']));
print_r(pg_convert($db, 'test', ['_date'=>'1999008']));
print_r(pg_convert($db, 'test', ['_date'=>'J2451187']));
print_r(pg_convert($db, 'test', ['_date'=>'January 8, 99 BC']));
print_r(pg_convert($db, 'test', ['_date'=>'epoch']));
print_r(pg_convert($db, 'test', ['_date'=>'infinity']));
print_r(pg_convert($db, 'test', ['_date'=>'-infinity']));
print_r(pg_convert($db, 'test', ['_date'=>'now']));
print_r(pg_convert($db, 'test', ['_date'=>'today']));
print_r(pg_convert($db, 'test', ['_date'=>'tomorrow']));
print_r(pg_convert($db, 'test', ['_date'=>'yesterday']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05:06.789']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05:06']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05']));
print_r(pg_convert($db, 'test', ['_time'=>'40506']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05 AM']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05 PM']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05:06.789-8']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05:06-08:00']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05-08:00']));
print_r(pg_convert($db, 'test', ['_time'=>'040506-08']));
print_r(pg_convert($db, 'test', ['_time'=>'04:05:06 PST']));
print_r(pg_convert($db, 'test', ['_time'=>'2003-04-12 04:05:06 America/New_York']));
print_r(pg_convert($db, 'test', ['_time'=>'allballs']));
print_r(pg_convert($db, 'test', ['_interval'=>'1-2']));
print_r(pg_convert($db, 'test', ['_interval'=>'3 4:05:06']));
print_r(pg_convert($db, 'test', ['_interval'=>'04:5:6']));
print_r(pg_convert($db, 'test', ['_interval'=>'1 year 2 months 3 days 4 hours 5 minutes 6 seconds']));
print_r(pg_convert($db, 'test', ['_interval'=>'1 year 2 mons 3 days 4 hours 5 mins 6 secs']));
print_r(pg_convert($db, 'test', ['_interval'=>'P1Y2M3DT4H5M6S']));
print_r(pg_convert($db, 'test', ['_interval'=>'P0001-02-03T04:05:06']));


Expected result:
----------------
All values submitted to pg_convert are valid, so all return values should be printed.

Actual result:
--------------
Array
(
    ["_inet"] => E'2001:4f8:3:ba:2e0:81ff:fe22:d1f1'
)
Array
(
    ["_cidr"] => E'2001:4f8:3:ba:2e0:81ff:fe22:d1f1'
)
Array
(
    ["_date"] => E'1999-01-08'
)
Array
(
    ["_time"] => E'04:05:06'
)
Array
(
    ["_time"] => E'04:05'
)
Array
(
    ["_interval"] => E'1 year 2 months 3 days 4 hours 5 minutes 6 seconds'
)