Blue Square Bet
Published 29th July 2012
Arber, 34, has a wealth of experience in football, previously playing for Stevenage Borough, Peterborough United and, most recently, Dagenham & Redbridge.
Collier played for Hampton and Richmond Borough in the Blue Square Bet South in 2011/12.
Arber said: "I'm coming to a football club that's on the up, and from what I see here, there's a good set of lads and it's a club that's going the right way."
Dartford manager Tony Burman stated: "One or two years ago, I wouldn't have ever thought I'd be having players like Mark coming here in the same office as me! He's come in and has been very professional and has been impressed with what he's seen."
Collier, who scored three times in 2011/12 for Hampton & Richmond Borough, has featured in every pre-season match for the Darts this season, signed following the 1-0 victory over Leyton Orient.