CentOS 7.x，不重新编译 PHP，动态安装 imap 扩展

# 安装依赖包
yum install -y libc-client-devel

/usr/local/src/centos-sdk/source2/php/php-5.6.30/ext/imap
/usr/local/php/bin/phpize

./configure -with-php-config=/usr/local/bin/php-config -with-imap -with-imap-ssl -with-kerberos -with-libdir=lib64

make && make install

echo “extension=imap.so” >> /etc/php.ini

# 重启 php-fpm
service php-fpm restart