Lidge would've been a free agent after this season. The 31-year-old right-hander has 19 saves in 19 chances and a 0.77 ERA in 35 appearances in his first season in Philadelphia.
Lidge is 2-0 with 47 strikeouts in 35 innings and set a club record by converting his first 19 save opportunities this season. He didn't allow an earned run through his first 17 appearances (17 innings), which was the second-longest by a Phillies pitcher to start his career with the team.
The Phillies acquired Lidge from Houston in November in a five-player trade.
