function install_ext_php {

    debug "Checking for the PHP GnuPG extension"
    PHP_HAS_GNUPG=$(php -r "echo is_callable('gnupg_encrypt');")
    PHP_VERSION=$(php -r "echo substr(PHP_VERSION_ID,0,1);")
    if [ "$PHP_HAS_GNUPG" == "1" ]; then
        info "GnuPG extension is installed"
    else
        info "Installing the GnuPG extension using pecl"
        case $PHP_VERSION in
        7)
            exec "sudo pecl install gnupg-1.4.0RC1"
            echo 'extension=gnupg.so' | sudo tee /etc/php/7.0/mods-available/gnupg.ini &>/dev/null
            exec "sudo chmod 0744 /etc/php/7.0/mods-available/gnupg.ini"
            sudo phpenmod gnupg
            ;;
        *)
            exec "sudo pecl install gnupg"
            echo 'extension=gnupg.so' | sudo tee /etc/php5/cli/conf.d/gnupg.ini &>/dev/null
            exec "sudo chmod 0744 /etc/php5/cli/conf.d/gnupg.ini"
            ;;
        esac
        exec "sudo chmod 0744 /usr/lib/php/*/gnupg.so";
    fi

}

install_ext_php