yum -y install libjpeglibjpeg-devel libpng libpng-devel freetype freetype-devel
cd
cd php/ext/gd/
/usr/local/php7/bin/phpize
./configure --with-png-dir --with-freetype-dir --with-jpeg-dir --with-gd --with-php-config=/usr/local/php/bin/php-config
make && make install
修改php.ini
