The walking wounded became the walking dead Thursday night — hardly the kind of preamble the Mets needed heading into a series with the defending NL East champions. An already hurting bunch was left to wonder about Yoenis Cespedes’ status, after the All-Star outfielder departed the Mets’ 6-4 loss to the Phillies at Citi Field with a left hamstring injury. Cespedes is scheduled to receive an MRI exam on the leg Friday. The team said he departed the game with a cramp in the hamstring, but Cespedes indicated otherwise. “It’s not a cramp — I felt, like a shock,” he said, adding that a doctor told him he will miss at least the next two or three games. “I’ve had this injury before. This time it doesn’t feel as serious as other times.” Cespedes’ hamstring injury came on a night the Mets were already without Lucas Duda, Wilmer Flores and had Travis d’Arnaud available only to pinch hit. Yes, the Mets (8-8) could use a few healthy bodies for the start of their three-game series against the Nationals on Friday.