1.首先去php官网下载一个php7版本源码包 http://php.net/downloads.php,我这下载的是php7.2.13版本.
2.使用ftp或者linux的rz命令将包上传到linux下，开始进行编译安装.
3.解压安装包
# tar -zxvf php-7.2.13.tar.gz
# cd php-7.2.13
#./configure --prefix=/usr/local/php7 --with-config-file-path=/usr/local/php7/etc --with-mcrypt=/usr/include --with-mysql=mysqlnd --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd --with-gd --with-iconv --with-zlib --enable-xml --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --enable-mbregex --enable-fpm --enable-mbstring --enable-ftp --enable-gd-native-ttf --with-openssl --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --without-pear --with-gettext --enable-session --with-curl --with-jpeg-dir --with-freetype-dir --enable-opcache
执行以上编译会出现报错
1.configure: error: jpeglib.h not found.
解决：yum -y install libjpeg-devel .
2.configure: error: png.h not found.
解决：#yum install libpng
# yum install libpng-devel
3.configure: error: freetype-config not found.
解决：# yum install freetype-devel
然后再次执行上面命令会出现：
+--------------------------------------------------------------------+
| License: |
| This software is subject to the PHP License, available in this |
| distribution in the file LICENSE. By continuing this installation |
| process, you are bound by the terms of this license agreement. |
| If you do not agree with the terms of this license, you must abort |
| the installation process at this point. |
+--------------------------------------------------------------------+
Thank you for using PHP.
表示配置文件检测成功，下面开始执行编译且安装
# make && make install
至此php就安装完成 .