简单安装（通过yum）

1. 安装epel-release
   <pre>rpm -ivh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm</pre>z
2. 安装PHP7的rpm源
   <pre>rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm</pre>
3. 安装PHP7
   <pre>yum install php70w</pre>

编译安装

1. 下载php7
   <pre>
   wget -O php7.tar.gz http://cn2.php.net/get/php-7.0.4.tar.gz/from/this/mirror
   </pre>
2. 解压php7
   <pre>tar -xvf php7.tar.gz</pre>
3. 进入php目录
   <pre>cd php-7.0.4</pre>
4. 安装依赖包
   <pre>

直接复制下面一行（不包括本行）

yum install libxml2 libxml2-devel openssl openssl-devel bzip2 bzip2-devel libcurl libcurl-devel libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel gmp gmp-devel libmcrypt libmcrypt-devel readline readline-devel libxslt libxslt-devel</pre>

5. 编译配置（如果出现错误，基本都是上一步的依赖文件没有安装所致）
   嫌麻烦的可以从这一步起参考PHP官方安装说明：http://php.net/manual/zh/install.unix.nginx.php
   <pre>
   ./configure
   --prefix=/usr/local/php
   --with-config-file-path=/etc
   --enable-fpm
   --with-fpm-user=nginx
   --with-fpm-group=nginx
   --enable-inline-optimization
   --disable-debug
   --disable-rpath
   --enable-shared
   --enable-soap
   --with-libxml-dir
   --with-xmlrpc
   --with-openssl
   --with-mcrypt
   --with-mhash
   --with-pcre-regex
   --with-sqlite3
   --with-zlib
   --enable-bcmath
   --with-iconv
   --with-bz2
   --enable-calendar
   --with-curl
   --with-cdb
   --enable-dom
   --enable-exif
   --enable-fileinfo
   --enable-filter
   --with-pcre-dir
   --enable-ftp
   --with-gd
   --with-openssl-dir
   --with-jpeg-dir
   --with-png-dir
   --with-zlib-dir
   --with-freetype-dir
   --enable-gd-native-ttf
   --enable-gd-jis-conv
   --with-gettext
   --with-gmp
   --with-mhash
   --enable-json
   --enable-mbstring
   --enable-mbregex
   --enable-mbregex-backtrack
   --with-libmbfl
   --with-onig
   --enable-pdo
   --with-mysqli=mysqlnd
   --with-pdo-mysql=mysqlnd
   --with-zlib-dir
   --with-pdo-sqlite
   --with-readline
   --enable-session
   --enable-shmop
   --enable-simplexml
   --enable-sockets
   --enable-sysvmsg
   --enable-sysvsem
   --enable-sysvshm
   --enable-wddx
   --with-libxml-dir
   --with-xsl
   --enable-zip
   --enable-mysqlnd-compression-support
   --with-pear
   --enable-opcache
   </pre>
6. 正式安装
   <pre>make && make install</pre>
7. 配置环境变量
   <pre>vi /etc/profile</pre>在末尾追加
   <pre>
   PATH=$PATH:/usr/local/php/bin
   export PATH
   </pre>执行命令使得改动立即生效<pre>source /etc/profile</pre>
8. 配置php-fpm
   <pre>
   cp php.ini-production /etc/php.ini
   cp /usr/local/php/etc/php-fpm.conf.default /usr/local/php/etc/php-fpm.conf
   cp /usr/local/php/etc/php-fpm.d/www.conf.default /usr/local/php/etc/php-fpm.d/www.conf
   cp sapi/fpm/init.d.php-fpm /etc/init.d/php-fpm
   chmod +x /etc/init.d/php-fpm
   </pre>
9. 启动php-fpm
   <pre>/etc/init.d/php-fpm start</pre>