php7 安装扩展报错解决方式：
- apt-get install build-essential libexpat1-dev libgeoip-dev libpng-dev libpcre3-dev libssl-dev libxml2-dev rcs zlib1g-dev libmcrypt-dev libcurl4-openssl-dev libjpeg-dev libpng-dev libwebp-dev pkg-config
安装以上软件包，还未解决执行以下命令
export PHP_OPENSSL_DIR=yes