Douglas had 21 points and eight assists against the Mavericks. This time against Philadelphia, he finished with seven assists and scored nine points in the fourth quarter.
"The coaches have a lot of confidence in me," Douglas said. "I have confidence in myself. I feel comfortable."
Douglas shot 7 for 13 and hit all four of his free throws in nearly 37 minutes.
"When Toney was on the court, we played a lot better," Knicks coach Mike D'Antoni said. "He hit a big 3-pointer for us and played with a lot of energy."
David Lee grabbed 16 rebounds as the Knicks improved to 2-2 on this five-game road trip.
"I thought our defense was a lot better in the second half," D'Antoni said.
Jrue Holiday scored 18 points, Willie Green added 17 and Andre Iguodala had 14 points and a career-high 17 rebounds for the Sixers (23-44), who have dropped five in a row and 10 of their last 11. The Sixers are just 10-22 at home.
"We had open looks," Sixers coach Eddie Jordan said. "We couldn't make shots."
After Holiday made a layup to get Philadelphia within 85-82 with 3:47 left, Douglas knocked down a 19-foot jumper and Gallinari connected on two free throws for an 89-82 advantage with 2:03 remaining.
"They tell me to shoot when I'm open," Douglas said. "We made some big shots as a team."
Iguodala missed a runner in the lane and Gallinari responded with a 3-pointer for a 10-point lead. The 7-0 run sealed New York's second consecutive win in Philadelphia for the first time since 2004.
Iguodala shot only 5 of 22 and missed all seven of his 3-pointers. Over his last four games, Iguodala is 1 for 19 from 3-point territory.
"He's human," Jordan said.
Trailing by nine points midway through the third quarter, the Knicks went on an 11-0 run to take a 67-65 lead with 2:31 remaining. Harrington scored five points during the spurt.
Dalembert kept the Sixers close with nine rebounds in the third, giving him 16 total. But Philadelphia fell behind 73-69.
"We have to find a way to make shots," Dalembert said. "We missed way too many open looks."
In the first half, Green scored 15 points on 7-for-15 shooting as the Sixers took a 55-44 lead into the locker room.
The Sixers played without G Lou Williams (back spasms) and F Marreese Speights (sprained right knee). Knicks C Eddy Curry missed the game with a sore right calf. ... The Sixers outrebounded New York 54-38.