PHILADELPHIA - Arizona quarterback Kevin Kolb now knows what it's like to be the other guy.

Two years ago, he began the season as the Eagles' starting quarterback, but got hurt in the opening game and lost his job to Michael Vick.

He started this season on the bench, but was called into action when John Skelton was injured in the opener. Kolb rallied the Cardinals to a victory, then led them to an upset win at New England last week.

He'll be the Cardinals' starter again Sunday when they take on Vick and the Eagles at University of Phoenix Stadium.

"It's somewhat ironic," Kolb said Wednesday in a phone interview. "But I know better than to look too far ahead. I learned a lot during my time with the Eagles. One of the things I learned was not to try to predict anything."

Not many people expected Kolb to be playing for the other team a few years ago.

When the Eagles traded quarterback Donovan McNabb to Washington on Easter Sunday in 2010, Kolb was annointed his successor and stayed in the lineup throughout training camp and the preseason. His status changed when Green Bay linebacker Clay Matthews slammed him to the turf in the 2010 opener, giving him a concussion.

Vick took over that game, nearly led the Eagles to a win, and went on to have a terrific season that landed him in the Pro Bowl. Eagles coach Andy Reid promised Kolb he would get his job back when healthy, then changed his mind. Kolb's four-year tenure with the Eagles ended in July, 2011, when he was traded to the Cardinals in exchange for cornerback Dominique Rodgers-Cromartie and a draft pick.

"I try not to live in the past, but in that Green Bay game, I never thought I'd be going into that game and playing that day," Vick said Wednesday. "I never knew what my career was going to be like, how it was going to take off, and where it was going to go."

Kolb, the Eagles' second-round draft pick in 2007, has had a weird career.

Upon signing with the Cardinals, the 28-year-old entered last season as their starter, but wound up missing seven games - including the Cardinals' 21-17 win over the Eagles - with a turf toe injury and concussion-like symptoms. Skelton beat him out during training camp this season for the starting job.

"My career's been wild," Kolb said. "Every time I think things are set, a curveball shows up. That's why I just take everything game by game, week in and week out. That's another less I learned in Philly. I learned not to let the highs and lows affect you that bad because you never know how quickly things can change."