cURL stands for the client URL. PHP CURL is a library, this can helps to communicate with other servers and it allows the user to create the HTTP requests in PHP on your PHP application, by default this extension is not installed in your instance, this post walk you through how to install CURL-PHP extension on your CentOS and Ubuntu Operating Systems.

On Ubuntu:

apt-get update

apt-get install php-curl

On CentOS:

yum update

yum install php-curl


Restart the webserver,

If you are using Ubuntu operating system use the command below,

NGINX:
service nginx restart

Apache:
service apache2 restart


If you are using CentOS operating system use the command below,

NGINX:
service nginx restart

Apache:
service httpd restart