[PHP] How can I convert these to hex or strings?

[David OBrien]

I'm running snmp against a huge list of printers and certain HP models
return

Model:
stdClass Object
(
    [type] => 4
    [value] => ☺§HP LaserJet P3010 Series
)

Serial:
stdClass Object
(
    [type] => 4
    [value] => ☺§VNBCC1917W
)

MacAddress:
stdClass Object
(
    [type] => 4
    [value] => ⌠╬F>╒'
)

I just strip the weird ones off the model and serial entries but I've been
pulling my hair out trying to convert the macaddress one to a hex string or
just a string
Can some one educate me or point me in the right direction?

David OBrien