This is the error message i get on try to install the MPDF/MPDF.
$ composer create-project mpdf/mpdf --prefer-dist
PHP Warning: PHP Startup: Unable to load dynamic library
'/usr/lib/php/20151012/gd.so' - /usr/lib/php/20151012/gd.so: cannot open
shared object file: No such file or directory in Unknown on line 0
You are running composer with xdebug enabled. This has a major impact on
runtime performance. See https://getcomposer.org/xdebug
[Composer\Downloader\TransportException]
The "https://packagist.org/packages.json" file could not be downloaded: SSL
operation failed with code 1. OpenSSL Error messages:
error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
Failed to enable crypto
failed to open stream: operation failed
I don't know what to do to proceed, can you help me ?