PHP Excel Library 설치

#### PHP Excel Library 설치를 위한 Composer 설치 #####
curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer
composer -V
export COMPOSER_ALLOW_SUPERUSER=1
composer -V
echo "export COMPOSER_ALLOW_SUPERUSER=1" >> ~/.bashrc
cat ~/.bashrc | grep export

cd /var/www/html/
composer require phpoffice/phpspreadsheet