Converting a POSTMAN request to Curl
Starting from Postman 8
you need to visit here
You can see the button "Code" in the attached screenshot, press it and you can get your code in many different languages including PHP cURL
Edited: As other answers said Postman UI was updated, I change the images accordingly
The first answer here works with the older versions of Postman. With the latest releases in 2021 the cURL can be found clicking this icon (circled in red)