I am looking for some hosting company which offer reseller pgm and they have strong support of PHP. Such as they know what PHP function is work and not work etc.

Just look hosts by using the search function or the hosts that posts on this board... Most support PHP, but I can'T tell if they actually _know_ php.

A good indication of whether a host will have good PHP support is whether their site is programmed using it, you could also try asking them - but then again they will no doubt try and tell you they invented it so that they can get your custom.

You will no doubt find a couple of hosts who do know PHP really well ( Like me :) - but then again we aren't open yet ).

Your best bet is probably to write support at hosts that say they support PHP. See what kinds of questions you can get answers to, and make your decision based off that.