I\'m trying to install Facebook PHP SDK with Composer. This is what I get
$ composer install
Loading composer repositories with package information
Installin
This is caused because you don't have a library php5-curl installed in your system,
On Ubuntu its just simple run the line code below, in your case on Xamp take a look in Xamp documentation
sudo apt-get install php5-curl
For anyone who uses php7.0
sudo apt-get install php7.0-curl
For those who uses php7.1
sudo apt-get install php7.1-curl
For those who use php7.2
sudo apt-get install php7.2-curl
For those who use php7.3
sudo apt-get install php7.3-curl
Or simply run below command to install by your version:
sudo apt-get install php-curl