php5.6安装gd库

rpm -Uvh http://ftp.iij.ad.jp/pub/linux/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm

rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

yum --enablerepo=remi-php56 install php-gd php-mysql php-mbstring php-xml php-mcrypt