When does Phineas and Ferb return?

Phineas and Ferb is an American animated musical-comedy television series. It was created by Dan Povenmire and Jeff "Swampy" Marsh for Disney Channel and Disney XD. The show follows the adventures of stepbrothers Phineas Flynn and his stepbrother Ferb Fletcher, who are between eight and ten years old, during summer vacation. Co-creator describes the show as a combination of Family Guy and SpongeBob SquarePants.
The show follows the adventures of stepbrothers Phineas Flynn and Ferb Fletcher, who live in the fictional city of Danville in an unspecified tri-state area. Co-creator Dan Povenmire, who had previously worked on Family Guy, sought to create a less raunchy show that would make similar use of comic timing, metahumor, humorous blank stares and wordplay.